Scrimage
Used in the term "Line of Scrimage," meaning the area between the balls and anus.
Thank God I wiped backwards and didn't get anything past the line of scrimage.
scrimage chick
This is the chick that you practice freaky sexual techniques with before trying them on your girlfriend or wife. Typically, not very attractive, but willing to try absolutely anything just to get some action. The chick used to perfect your game/moves.
Last night I fucked my scrimage chick's armpit and came all over her. I am glad that I got that out of my system, it would never work with wifey.