To give someone anal 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??
by the real rick james December 6, 2005
Get the surprise buttsecks mug.
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
by MDspyro February 16, 2007
Get the Suprise buttsecks mug.
When going at it like dogs, 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!!!!!!
by The Poonman July 3, 2009
Get the Surprise Buttsecks mug.
Jim giving Mary surprise buttsecks (although results may vary):
Jim: Surprise!
Mary: Whoo hoo!
by The Anonymouse August 22, 2008
Get the Surprise Buttsecks mug.
When you come out of now where, trying to Rhino someone. Going as hard as you can, best if they are talking to a friend/girlfriend/boyfriend
Man 1: Yo, I got MW2 last night
Man 2: Sweet bro
Man 1: Yeah, I beat the snowmobile level
Man 2: Really man, sweet, I am up t......
Man 3 (Rhino Man 2): SUPRISE BUTTSECKS
by DoubleA Ace April 9, 2010
Get the Suprise Buttsecks mug.
If someone denies you anal all you have to do is take it from them. It's not rape if you say surprise!

They will enjoy the pleasure so much they will show you their tears of joy

If they cry, use the tears as lubrication or as a punishment use no lube at all.
Surprise Buttsecks:

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.
by Siimp January 24, 2010
Get the Surprise buttsecks mug.
The technical explanation of why male/male relationships are so popular with heterosexual women in fandom.
Buttsecks Math is a fairly simple equation! Even your boggled boyfriend can get it!
1 pretty man = good

1 pretty man + 1 pretty man = better

kissing = very good

(1 pretty man + 1 pretty man) kissing = doubleplusgood
by Regimus Prime January 5, 2007
Get the buttsecks math mug.