jack!sper 

A name used to refer to the combination of Jasper Hale (from the Twilight series) and Jackson Rathbone, who plays Jasper in the movie Twilight. This term is specific to the movie character, as opposed to just Jasper, or just Jackson Rathbone. Often the word is misspelled due to omission of the exclamation point.

Did you see paparazzi Jack!sper in the new MTV Twilight interviews?

jack!sper by PlanxtyLewis April 14, 2008

sperm-jack 

The process of taking someone's sperm and using without their permission

Kathy is trying to sperm-jack Paul so she can have a baby on her own.

sperm-jack by Lorcán000 January 14, 2009

sperm jack 

To commit forcible theft of sperm.

After Jane handcuffed John to the bed she preceded to jack him off in order to extract sperm. When he climaxed she put the sperm in a small container, got dressed, and left. John was sperm jacked!

sperm jack by J-Fad December 15, 2008

sperm jack 

To commit forcible theft of sperm.

After Jane, sperm thief extraordinaire, handcuffed John to the bed she proceeded to jerk him off in order to extract sperm. When he climaxed she put the sperm in a small container, got dressed, and left. John was sperm jacked!

sperm jack by J-Fad December 15, 2008