Definitions by Moskau

Harness Jack 

To jack off while parachuting.

Bob: Hey dude, lets harness jack!
Jim: Alright!!

Harness Jack by Moskau September 23, 2005

Combat Jack 

To jack off in the middle of a firefight, or any combat situation.

Bob: Oh shit man, I'm scared of these Sammies.
Jim: Let's just combat jack to relieve the anxiety!

Combat Jack by Moskau September 23, 2005