nub cannon

Any weapon in a FPS (first person shooter) game that has the quality of

1. being extremely easy to use
2. being extremely powerful

a nub cannon, also knows as a n00b cannon, a NUBZ cannon, etc etc is usually something that people bitch about when they get PWNT.

The people who complain usually turn out to be nubs anyways, as l33t players don't fall prey to nub cannons.