Foot deep

After you've had rough sex and you see how deep her vagina is with your foot

Girl :What the hell did we do last night?
Guy:I tried to get foot deep

he sheath

A condom

He forgot his he sheath so no sex for him tonight.

that shit deep

When your in a girl and your balls hit her butt hole

Guy1: How'd it go last night?
Guy2: I got that shit deep bro.