Flat Shtick 

Flat Shtick i.e The Penis.

Aww lad, she's mint.She'd get some amount of the Flat shtick!
to give someone the flat shtick meaning to have intercourse with a young female(YUSS).

Flat Shtick by Lang Xieu November 8, 2014

flat stick 

flat out, busy, unable to stop, lots on your plate. the busiest of the busy and too busy to stop and do the little things.

Bob: "Dude, did you get that email?"
Jon: "Nah bro, I'm flat stick!"

flat stick by Vi3tnow April 4, 2009