What does Bunk Fuck Bunkfuck mean?

Bunk Fuck Bunkfuck meaning in Urban Dictionary

When two units of partners take part in sexual intercourse as well. One set fuck on the top bunk while the various other set fucks in the bottom, correspondingly Bunk and bang assembled into one-word, you will do the math. May be used at all at all, but typically used in unfavorable terms.