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Literally - The bag of balls thats hangs beneath the penis/cock/dick/nob as part of the male genitalia.

Metaphorically - Someone who you really dislike and want to insult. It usually just comes out as you cannot think of a better insult.
"Jonathan i dislike you"

"Yeah well i think your a complete ... nobsack"
nobsack by Josh_Guernsey May 30, 2006
Related Words
Multi-purpose term to be used in any number of circumstances. Less harsh than dickhead. A variation on nobhead. Means scrotal sack, or scrotum, but sounds much better and gets quite addictive.
Oi nobsack, do you want a cup of tea?

or

Alright nobsack, what are you up to later?

or

Americans, what a bunch of nobsacks
nobsack by Cundyboy January 23, 2004
Long form of sac. Basically, it's a ballbag, or a scrotum if you prefer.
Kiss my hairy nobsac.
nobsac by Ian Chode April 2, 2003
A young virgin that recently became pregant;a small weiner; a supporter of Larry;



the foreskin of a donkey dick that ha ben recently chowed and shat on.
Yeah my dog brought a Nosaj home yesterday and I smelt like rotten ham with jelly attached.


(a girl talking) Yeah i was with Billy last night and he had a Nosaj.
Nosaj by frankier reddington February 1, 2009
a person who is not being very sensible .
for christs sake luke .... grow up and stop being such a NOBSACK.
nobsack by tom November 26, 2003
nobsack by Ian Chode September 22, 2003