An individual who has a strong affection and attraction towards butts, usually in a sexual manner. Most buttfreaks are biological males who are instinctual drawn to the glorious sight of the varied shapes and sizes of the female butt. Most may occasionally be mistaken for a pervert.
My girlfriend slapped me today because I couldn't stop looking at some hot body butts while we were at the pool. It's hard being such a buttfreak.
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??