Here is a list of common Chinese-language internet terms, expressions, acronyms, or slang. I will update it over time. Hope it helps you better understand some of the funny or offensive language often used by Chinese people online (and also offline for some).
  
 A片 [A piān / A pian1]noun. Link to this entry. 
 棒子 [bàngzi / bang4 zi]noun. Link to this entry. 
 BS = 鄙视 [bǐshì / bi3 shi4]verb. Link to this entry. 
 BT = 变态 [biàntài / bian4 tai4]adjective. Link to this entry. 
 操 [cào / cao4]offensive. Link to this entry. 
 草泥马 [cǎonímǎ / cao3 ni2 ma3]pun/noun/expression/offensive. 操你妈  cao ni ma, “fuck your mom.” It was created by the Mop BBS in early 2009, maybe in response to government censorship.Link to this entry. 
 操你妈 [càonǐmā / cao4 ni3 ma1]offensive. Link to this entry. 
 操你妈的屄 [càonǐmādebī / cao4 ni3 ma1 de bi1]offensive. Link to this entry. 
 CCAV = CCTV noun. Link to this entry. 
 CN = 册那 [cènà / ce4 na4]offensive. 操 “cao” , but maybe a little less strong.Link to this entry. 
 CN = 处女 [chǔnǚ / chu3 nv3]noun. Link to this entry. 
 打酱油 [dǎjiàngyóu / da3 jiang4 you2]expression. Link to this entry. 
 倒 [dǎo / dao3]expression. Link to this entry. 
 顶 [dǐng / ding3]verb. Link to this entry. 
 FL = 发廊 [fàláng / fa4 lang2]noun. Link to this entry. 
 非主流 [fēizhǔliú / fei1 zhu3 liu2]noun. Link to this entry. 
 FQ = 愤青 [fènqīng / fen4 qing1]noun. Link to this entry. 
 粪青 [fènqīng / fen4 qing1]noun. 愤青 .Link to this entry. 
 粉丝 [fěnsī / fen3 si1]noun. Link to this entry. 
 GC = 高潮 [gāocháo / gao1 chao2]noun. Link to this entry. 
 GG = 哥哥 [gēge / ge1 ge]noun. Link to this entry. 
 狗日的 [gǒurìde / gou3 ri4 de]noun. Link to this entry. 
 滚滚 [gǔngǔn / gun3 gun3]noun. Link to this entry. 
 国猪 [guózhū / guo2 zhu1]noun. Link to this entry. 
 汗 [hàn / han4]expression. Japanese anime .Link to this entry. 
 河蟹 [héxiè / he2 xie4]pun/adjective. Link to this entry. 
 很黄,很暴力 [hěn huáng hěn bàolì / hen3 huang2 hen3 bao4 li4]expression. Link to this entry. 
 很傻,很天真 [hěn shǎ hěn tiānzhēn / hen3 sha3 hen3 tian1 zhen1]expression. Link to this entry. 
 火星人 [huǒxīngrén / huo3 xing1 ren2]noun. Link to this entry. 
 J8 = 鸡巴 [jībā / ji1 ba1]noun. Link to this entry. 
 JJ = 鸡鸡 [jījī / ji1 ji1]noun. Link to this entry. 
 加油 [jiāyóu / jia1 you2]expression. Link to this entry. 
 JC = 警察 [jǐngchá / jing3 cha2]noun. Link to this entry. 
 囧 [jiǒng / jiong3]emoticon. Link to this entry. 
 JY = 精液 [jīngyè / jing1 ye4]noun. Link to this entry. 
 KB = 恐怖 [kǒngbù / kong3 bu4]adjective/expression. Link to this entry. 
 雷 [léi / lei2]verb/adjective. Link to this entry. 
 泪 [lèi / lei4]expression. Link to this entry. 
 LB = 篱笆 [tǔfěi / tu3 fei3]noun. Link to this entry. 
 LJ = 轮奸 [lúnjiān / lun2 jian1]verb. Link to this entry. 
 LZ = 楼主 [lóuzhǔ / lou2 zhu3]noun. Link to this entry. 
 MB = 妈比 [mābī / ma1 bi1]noun. MLGB  that also means “mother’s cunt.” Maybe similar to English’s “motherfucker.” The “B” could be any Chinese character with the “bi” sound like 逼 or 比. In fact, 屄 is the true character but almost never used.Link to this entry. 
 ML expression. Link to this entry. 
 MLGB = 妈了个逼 expression. Link to this entry. 
 MM = 妹妹 [mèimèi / mei4 mei4]noun. Link to this entry. 
 脑残 [nǎocán / nao3 can2]noun. Link to this entry. 
 牛 [niú / niu2]adjective. Link to this entry. 
 NB = 牛屄 [niúbī / niu2 bi1]noun/adjective. Link to this entry. 
 偶 [ǒu / ou3]pronoun. Link to this entry. 
 PK verb/noun. Link to this entry. 
 PS = Photoshop verb/noun. Link to this entry. 
 QJ = 强奸 [qiángjiān / qiang2 jian1]verb. Link to this entry. 
 日 [rì / ri4]verb./offensive Link to this entry. 
 RT = 如题 [rú tí / ru2 ti2]verb. Link to this entry. 
 SB = 傻屄 [shǎbī / sha3 bi1]noun/adjective. Link to this entry. 
 沙发 [shāfā / sha1 fa1]noun/adjective. LZ  is the topic starter or original poster and thus the “owner of the house.” The first person entering the “house” and replying gets the “sofa.” So “sofa” means the first replier/reply. Sometimes written in English as “sofa.”Link to this entry. 
 山寨 [shānzhài / shan1 zhai4]noun/adjective. Link to this entry. 
 SY = 手淫 [shǒuyín / shou3 yin2]verb. Link to this entry. 
 凸 [tū / tu1]emoticon Link to this entry. 
 TF = 土匪 [tǔfěi / tu3 fei3]noun. Link to this entry. 
 TMD = 他妈的 [tāmāde / ta1 ma1 de]offensive. Link to this entry. 
 WDR = 外地人 [wàidìrén / wai4 di4 ren2]noun. Link to this entry. 
 WW = 湾湾 [wānwān / wan1 wan1]noun. Link to this entry. 
 小三 [xiǎosān / xiao3 san1]noun. Liba .Link to this entry. 
 晕 [yūn / yun1]expression. Link to this entry. 
 YD = 淫荡 [yín dàng / yin2 dang4]adjective. Link to this entry. 
 YY = 意淫 [yì yín / yi4 yin2]verb. Link to this entry. 
 ZF = 政府 [zhèngfǔ / zheng4 fu3]noun. Link to this entry. 
 装B = 装屄 [zhuāng bī / zhuang1 bi1]verb. Link to this entry. 
 ZG = 中国 [zhōngguó / zhong1 guo2]noune. Link to this entry. 
 ZW = 自慰 [zìwèi / zi4 wei4]verb. Link to this entry.