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1.
A method to in which one shows affection or hunger by 'eating' another person, animals or various inanimate objects. It's often a compliment....or a very hungry person looking for a quick snack. Probably out of you.

It's often a symbol of friendship or lurve. Unless the person has pointy teeth..then it's quite painful.

People have been known to respond to gnaws with : chew, nibble, counter-gnaw, various yells, and death glares.

It's also a wonderful way to greet a person, as shown below. (screennames have been changed so there :p ) taken from real conversations.
Auto: *gnaaaaw*
Moony: *Cheeew*

Moony: *Gnaw*
Hell: -Huggles-
Moony: ^-^ I feel lurved
Hell: ^^ you are

B-chan: *Gnaw*
N-chan: Ah!! No teeth!
B-chan: *Blink, blink* ...Rawr?
N-chan: ... *smacks you with pillow*
B-chan: ...;.;
N-chan: ^_^
by Aime F-Z October 29, 2004
 
2.
1. Gnaw is wang backwards.

2.Gnaw is a way to say that was completly useless.

3.Gnaw is a way to express not wanting to do something

4.Gnaw is a form of acknoledgement.
1.gnaw=wang

2."Hey i like cheese""tch, ur gnaw"

3" honey go clean up the garage. please" "GNAW! im too tired, I will do it tommorow."

4." hey man you want to go to the halo tournament?" " GNAW!. Why wouldn't I"
by Shadow A Myers March 13, 2005
 
3.
can be used in any word!
I totally just gnawt myself!
by im a big boss December 15, 2010
 
4.
1. Plug of chewing tobacco, chew, dip, &
Dude, gimme a gnaw.
She wanted to french, but I had a gnaw.
by armsnlegs May 24, 2004
 
5.
Another way of expressing that you don't want to do something.
Instead of NO, you say GNAW: -

"Do you want to go for a drink?" "Gnaw, not tonight"
by P.Niddle May 30, 2007
 
6.
wang backwards... wangnaw ang gnaw
. wang......... gnaw. i hate having to do these
by bobweadababyitsaboy January 06, 2005