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!!
To give someoneanal sex at an unexpected time, or place. Perfect for those special moments.
A: Me and my gf had a really romantic date last night. Saw titanic.
B: nice A: yeah, and then when that stupid boat sank, i gave her surprise buttsecks!!!1 kekekekeekk
B: WTF??
When going at it likedogs, the penis, moving quickly, then ejects from the vagina and enters the anus, often resulting in pain and extreme terror/pleasure.
Often to calm the victim of this "surprise", the penetrator yells
"SURPRISE BUTTSECKS!!" in a vain attempt to make light of this magical , yet, often horrible experience.
Man: Oh yeah baby
Woman: Harder!
Man: opps i slipp.....
Woman: Ow. OWWWWW!!!!!!!
Man: Surprise Buttsecks!!!!!!
Woman: this date is over! Bus driver let me off here!!!!!!
Guy: Baby, can I stick it in your pooper?
Girl: No because it will hurt.
Guy: I'll be gentle, I'll go slow.
Girl: I said no, I told you to stop asking.
Guy: Oh well......SURPRISE!!
Girl: OMG! , STOP!, NO!
Guy: When you say no, all I hear is, "No don't stop"
Girl: This is rape!
Guy: I said surprise and it's not rape if you say surprise.