Definitions by NMU-K

SBS

SURPRISE BUTT SEX!
A shocking experience when an object, professor, or person pops up from behind and anally attacks you, while screaming "SBS".

"Man, i just SBSed the SHIT outta that psych. test!"
Guy 1- "SBS!"
Guy 2- "Aww you got me!"
On-looker- "It's not rape if you say surprise..."

SBS by NMU-K December 15, 2008