1 definition by NMU-K

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..."
by NMU-K November 26, 2008
Get the SBS mug.