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1.
In the game, "Call of Duty", is the act of "no-scope" sniping while the barrel of the sniper rifle is touching or nearly-touching the opposing player. If the barrel of the gun is 3 or more feet away from the opposing player, it is not considered a "Barrel Stuff". Barrel Stuffing is considered the "noob" way of "no-scope" sniping. Therefore, it won't be taken lightly by other players if you consistently "Barrel Stuff".
What a Noob, he's Barrel Stuffing...
by TheDudeThatKnows101 June 05, 2011
 
2.
Another word for butt sex.
" Hey babe, you wanna go barrelstuff"
by da nikster! October 07, 2011