Strap Slap 

A prank, usually which teenagers, in which a boy goes up behind a girl, grabs her bra through the shirt, pulls it back, and let's it go, making the strap slap her back.

"Damnitt! Todd just Strap Slapped me."

Strap Slap by Drummerdude95 April 5, 2009

strap slap 

Stemming from BRC or Bra Removal Confusion.
It occurs when one (either male or female) cannot undo a bra and the strap (in front, back, or side) and it slips, immediately followed with a whipping sound that results in minor to severe bruising on the shoulder blades, spinal column, or breasts.

My boyfriend can't take my bra off properly. I keep getting f***ing strap slap!

strap slap by patty-o-pinch-me-youdie October 13, 2006

slap the straw 

this is analogous to "hitting the hay", meaning to sleep.

Boy: I'm gonna go to my bedroom to slap the straw.
Mother: Alright, have fun.

slap the straw by Slappin' my straw. January 25, 2011