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 3, 2004
 Get the backmug.
Get the backmug. 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 23, 2006
 Get the backmug.
Get the backmug. by Michael p. jones February 26, 2006
 Get the back itmug.
Get the back itmug. 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 25, 2011
 Get the back-to-back jacksmug.
Get the back-to-back jacksmug. by IamblacksoIknow October 10, 2015
 Get the back-to-backmug.
Get the back-to-backmug. by deathbygirth July 16, 2004
 Get the backmug.
Get the backmug. 