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A term intended to offend. Used as an insult, meant to replace terms like shithead, fuck-bag, asshole.
I hate that guy he's such a fucking knapsack.
Knapsack by rollingtortilla September 14, 2014
The female teabag. when a girl gingerly plops her funbags on another fellow's head or face. Usually resulting in a smile.
Omg...best past-time ever? Knapsacking.
knapsack by Humphrey Ballsack March 3, 2011

cotton knapsack 

When an old man sends you a text picture of his frozen penis with his tighty whities around his ankles.
That sick fucker sent me a picture of his cotton knapsack, again
cotton knapsack by crammystad September 25, 2018

Dutch Marines Knapsack 

A bag with one strap worn by metrosexual or homosexual males. Looking suspiciously like a manbag, but usually with a utilitarian design lacking the flair or self confidence of a genuine man bag. Consequently it is hard to determine if wearers of such an item are either metrosexual or homosexual and are more likely to be bicurious.
Brian: Geez Dave, whats with the man bag?

Dave: Its not a man bag, its a Dutch Marines Knapsack.

nice knapsack 

when someone is referring to your very unattractive backpack. so therefore they are mocking you and they are calling it a knapsack
"AYYY JOHN!! NICE KNAPSACK YA GOT THERE!"

sometimes, this word can be said like you have a lisp. and it would be spelled like this: knapshack
nice knapsack by slaponte June 7, 2007

knapsacking 

v. The process of traveling while carrying no more provisions than can be contained in a knapsack.
After graduation, the beautiful little woman went knapsacking across eastern Europe.
knapsacking by Saffi Mae October 2, 2013