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.
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
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clear the way or get out of the way.
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The back back is the 2 seats in the back of a seven seat car
Your going to have to go in the back back
Can you pop up the seats from the back back
Can you help me get out of the back back
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when a nigga make you cum multiple times in one or more positions
my man stay having me cum .. his back to back technique strong as fuck .
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When an individual's ass is so flat it's like their back just keeps going.
He so flat, that back got back.
Her back got back.
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Sack to back is the term used when two males ride a motorcycle or scooter together.
Also referred to as "Butts to Nuts"
Those guys are riding "Sack to Back or Sac to Back"