When you're having sex in the cowgirl position and the guy pulls out and cums on the girls back. The boy then announces that he will be doing a "yeboii" and proceeds to say "yeeebooooiiiiiiii" to a suitable volume, almost loud enough for others to hear but not quite so you never really know.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)