不干不净

Explanation: Net: clean. Refers to the vulgar, obscene. Adulterous euphemism 　　Usage: Joint type; as the predicate attribute; containing derogatory 　　Source: Qing Cao Xueqin's "Dream of Red Mansions" 10 back: "I do not know where the students attached to school, back to bully him, and some Buganbujing the words inside." Thesaurus:  Bakuidanzao, Dongtouximo