Top Definition
Noun. A marathon, or extended session, of bros chilling together. Participants must be bros. Lax pennies or beer must be involved. Note: a brochillathon in which ladies are present is more commonly known as an orgy.
Noun. A marathon in which one competes while drinking natty instead of water.
Erik: Dude, we haven't hung out in forever
Jon: I know man, we're definitely due for a brochillathon
Erik: I'll bring the brewskies

Bro: Dude, I just ran the Boston Marathon two-fisting nattys the whole way, it was an epic brochillathon.
by orginalbrochillathon March 22, 2011

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