賣屎窟 [卖－－]

Jyutping maai6 si2 fat1
Pinyin mài shǐ kū

Definitions (Wiktionary)
  1. verb, Cantonese, figuratively, verb-object, vulgar
    to bribe
  2. verb, Cantonese, literally, of a male, verb-object, vulgar
    to prostitute one's anus to another male