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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.
*Having sex in cowgirl position*

Guy: Fuck I'm gonna cum
*pulls out and cums on girls back*
Guy: I'm gonna do a yeboii
*Gathers himself*

Guy: "YEBBBOOOOIIIIII"

Girl: What the fuck?
by Roshix January 17, 2018
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