a back is a very useful part on the male human body which is very good for scratching up during sex while you have multiple orgasms.
by mandythestoner October 03, 2004
The residue left in a crack pipe after the rock is smoked. The crackhead then uses the pusher the force the scrubber to the other end of the pipe to collect the back. The back can then smoked as well.
by TheConcierge September 21, 2006
by Michael p. jones February 23, 2006
1. In baseball, when two consecutive batters each hit a home run.
2. The act is sitting back-to-back with someone, while giving each other reach-around manual stimulation.
2. The act is sitting back-to-back with someone, while giving each other reach-around manual stimulation.
1. "Dude, I went to the Orioles game last night and Roberts and Markakis hit back-to-back jacks!"
"What was the final score?"
"They lost 10-2."
2. Tom and Kevin had some drunken back-to-back jacks last night, claiming it's not gay if they can't see what they're doing
"What was the final score?"
"They lost 10-2."
2. Tom and Kevin had some drunken back-to-back jacks last night, claiming it's not gay if they can't see what they're doing
by Castrati July 24, 2011
by IamblacksoIknow August 28, 2015
by deathbygirth July 16, 2004