Top definition
When a grenade horn is used to drink beer vertically, as if it were a beer bong. Grenade Bongs are strictly for "Bros", and should never be used by an actual grenade.

-The Grenade Bong originated from ODU in Virginia on October 20, 2011 at the district. "Beef Cake" and "Swag Master" are the founders of this wonderful college pastime.
Tarah K. and Jourdan N. took those Grenade Bongs like champs last night on Thirsty Thursday. They are such Bros!

They also received a respectable amount of lap dances that night.
by brODU October 21, 2011
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