A copious vagina which is moist and musty from a hard day pounding the streets.
Awh that lass from the pub had a right musty backpack!
by Krinthor April 12, 2019
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When you wrap barbed wire around your penis and insert it into a vagina or anal cavity.
Bob: Did she like that cactus in a backpack yesterday?
Steve: Oh yeah, she said it was the best cactus in a backpack she's ever gotten.
by Cactus D'Cactus December 10, 2014
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Verb: to put a backpack on a very drunk person before they go to bed, so as to keep them on their side in the recovery position and stop them from rolling onto their back so they don't choke on their vomit in their sleep
We're going to have to backpack Ally tonight and make sure to put something heavy in it because she just finished a fifth of vodka
by sassyras July 19, 2015
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when a female under 5”3 spoons a taller male in bed
“Me and my bitch was in bed yeah and don’t think she was tryna backpack man”

“Me and my boyfriend backpacked all night long
by spruce lee January 01, 2021
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"Hey, dude that's a nice pack on your back is that a backpack?"
"Yeah man, I got it recently it's Gucci, you jealous?"
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