To 'Crotch Out' or 'Crotching Out' is when a female sits or slouches in an unladylike fashion (often for comfort reasons), with her legs akimbo and her crotch or vagina facing outwards.
It is more frequently seen on sofas, and in the presence of close friends/other females.
It is occasionally used as a mating display.
I'm just going to crotch out on this chair.
Look at her, crotching out over there.
A male who lowers their drawers and proceeds to rotate his hips in order to project & swing his member in a motion that resembles that of a ferris wheel or helicopter. This is often done from an open window on public transportation or a trolley.
Look! That guy just went by in the trolley & Kenosha crotchcoptered us all!