Top Definition
A party thrown during your last semester at college. The graduate buys one or more kegs of beer and invites all of their friends to drink for free. This sometimes involves liquor as well. A tradition at Michigan Technological University.
Kate: I spilled beer all over the couch and my crotch at Mike's senior barrel. I was so embarrassed.

Dirk: Mark is charging for his senior barrel. Weak sauce. I don't think anyone is going to show up.

Tyler: I tried to get a keg of TILT for my senior barrel, but they don't make them them. I did get a free can cozy though!
by trashed20 June 29, 2008

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