Like a car slut but for motorcycles.

Backpack referring to a female bike whore, Usually named Edina.
Backpack: "He can do mad wheelies! idc if he's got a Mrs, I'm riding on his bike tonight"
by M I S S R E V E N G E ! December 21, 2017
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A dom top that is significantly shorter than their bottom partner.
For particularly clingy tops: It’s like when you’re getting ready to leave the house: keys, phone, wallet...backpack!

I just met this guy, he was super aggressive...a total backpack.
by 😘😜👋🏻 February 02, 2019
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A contributing factor to the growth of back pains. To help with the stress of all students this was invented to give teachers the excuse to load you with every book they want. Weight limits should be an obtainable thing.
Are you going on a vacation? Or to study?

A backpack should be and item to carry when camping.
by ThePerplexingH May 07, 2015
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Eugene's tool for carrying his AK-47 while shooting up the local school.
When Eugene reaches into his backpack, you know it's time to run.
by TheCubesAreWarlords April 11, 2017
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Someone who has muscles on their back (naturally or by flexing).

The look of having triceps and biceps on your back muscles.
girl 1: whoooa, check out that hottie!
girl 2: Daaaang gurl, that boy's got a kickass backpack

boy 1: Yo, check out my backpack!
girl 1: sigh, i wish my boyfriend carried a backpack like yours...
by RRELLO February 18, 2010
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Dora's knapsack from the kids show Dora the Explorer. Backpack is another of the inanimate, yet talking objects from the beloved children's show. Backpack is evidently very efficient for Dora, because she carries her drugs in there.
...I'm the Backpack loaded up with things and knick-knacks too, anything that you might need, I've got inside for you...Backpack, backpack...yay!
by Leiko October 07, 2004
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To get smacked down so hard you never get back up again. Usually used in non-digital esports, such as Magic: The Gathering, Yu-Gi-Oh!, or Pokemon. This term originates from someone trying to look at the round pairings and the neckbeard in front of them turns quickly, smashing them with a backpack full of nerd-cardboard.
I backpacked that mother fucker in round 3; he quit the whole damned tournament and sold his deck to the vendors.
by Backpack Grinder September 22, 2018
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