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Meaning that you can see someone's butt crack or underwear slightly as a person is bending over similar to the zipper of a backpack being slightly open.
(Emily bends down to grab books) Me: Hey Emily you've got an open backpack
Emily: Did you notice my new Victoria's Secret thong?
Me: No I was just looking at your crack.
Emily: You're an asshole.
Me: LOL get it?
Dry anal. The receiving partner stands while the giving partner sits on a table or high chair behind them. The giving partner wraps their legs and arms around the receiver, who then steps forward and carries them like a hiking pack. Penetration ensues.
Popular among feminists and power bottoms.
"I gave Jill a dusty backpacker last night. We ran out of lube but she's been doing squats lately so it turned out alright, dude."
Used by a Eugene, typically the day after they snap. The backpack is heavy due to the AK.
Oh no, Eugene has a Heavy Backpack.
Shorthand for perishable food left in non-climate controlled storage such as a backpack or trunk of a vehicle.
Emilio ate some backpack chicken and was sick af for a week.
That skatergirl looks like a backpack bisexual
A sex act in which a male is mounted by their partner in a "piggyback" style, wrapping their legs around the the front of the body, and masturbates the male with the arches of their feet (to completion).
My quads are exhausted after that Australian Backpack I got from Meghan last night
When a female companion uses your scrotum as a condom over her tightly clenched fist before she inserts it in your rectum
Went to 7-11 for some smokes and bumped in to Tammy Lynn, bada bing bada boom 10 minutes later she’s giving me an Iraqi backpack! Really took me back to my youth.