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1.
An unbalanced weapon in first person 'shoot-em-ups'. Typically used by noobs and constalty complained about by other players. A more seasoned player often does not use such a weapon on principal.
Example:

- "Hey, look at my score 26:3"
- "Put the fag cannon down then see how you do --- noob!
by The Spike February 23, 2007
30 20
 
2.
The mouth, or where one puts fags.
Tommy went down to the pub to water the ol' fag cannon.
by slorp October 08, 2006
27 18
 
3.
a gun that is unbalanced in comparison to other guns............most common among n00bs
look at that ball/less nub use the fagcannon sd

by fabioftwomgwtf April 22, 2006
3 4