When the spy, featured on the PS3, and PC game, Team Fortress 2, attempts to stab you (one of the 8 other male characters) in the back, but instead, gives you "Surprise Buttsecks" after, the trending songs and videos on YouTube.
*The Blue Scout, is defeating the red team when suddenly-*
Spy: "SURPRISE BUTTSECKS", BUTTSECKS, B-B-B-B-B-BUTT-SECKS!!
A: Me and my gf had a really romantic datelast night. Saw titanic.
B: nice
A: yeah, and then when that stupid boat sank, i gave her surprise buttsecks!!!1 kekekekeekk
B: WTF??
The action of suprising someone...
With Buttsecks.
To achieve the perfect "SB" one must carefully position themselves behind the victim, then scream suprise buttsecks.
Ted: Hey Bob I'll give you 5 bucks you suprise buttsecks Ed
Bob: K
*positions*
Bob: SUPRISE BUTTSECKS Ed: OMG