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2.
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.
by Humphrey Ballsack February 15, 2011
 
1.
1.)Another term for back-pack, yet not quite as popular.
2.) Used mostly in the early-mid 1900's by New Yorker's.
"Where the weed at?"
"It's in my knapsack, but you can't touch that!"
by Amber46290 August 15, 2008
 
3.
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.
by rollingtortilla September 14, 2014