brain grenade 

opening a beer, where the act of popping the top is much like pulling the pin on a grenade and the effects are felt the next day

dude gimme a brain grenade

brain grenade by cheaptrickrick December 13, 2009

brain grenade 

Because of the unusual grenade-like shape of the bottle, Mickey's beer (in the "Big Mouth" bottles) are called brain grenades. Because the bottle shape is unique to Mickey's and patented, it is technically NOT correct to call any other kind of beer "brain grenades."

What kind of beer do you want?
Toss me a brain grenade.

brain grenade by Artation December 12, 2007