butt tuck

the crease where the butt ends and looks like it tucks under. Only viewable on big booty chicks.

DAMN!!! Look at the butt tuck on that broad

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Butt-tucked

When one tucks their butt to hide their boner.

"Man, We can't hug right now. I just saw the hottest girl and now I'm butt-tucked"

"You couldn't even call that slow dancing... His pelvis was more forward than his shoulders. So freakin butt-tucked"