Sentence:  Yeah, but not everybody's mother is a prostitute. ... For as long as I can remember she'd bring blokes home and make me stay in the bed and watch while she <WSD>boofed</WSD> 'em. ... One time she even made "me" do it to her. ... Jesus, man! You <WSD>boofed</WSD> your own "mother"? 
Meaning of the word marked with <WSD> tags:  To have anal sex with someone, usually as the penetrative partner (possibly with negative connotations).