What is Flat Stanley?
1.
The act of pressing down hard enough to feel the contour of the male genitalia through his pants.
I needed to check out his package, so I gave him a "flat stanley".
2.
1) A Boner
2) A children's Book from the '60's from which the term got it's name.
*Note that the term can be used two ways, to refer to a boner, or to address one.
1) I was sitting in math and got a major flat stanley.
2) Hi flat stanley, do you wanna come out and play?
See
3.
a fighting move that slams a guy down.
i gave him a flat stanley.
See