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1.
The act of drinking beer and peeing simultaneously. Having already drunk large quantities of beer makes the act even more incredible.
Seamus is beer peeing! It's the best thing I've ever seen!
by garthvanderhoff August 03, 2010
 
2.
When you pee a lot because of drinking too many beers.
I had to beerpee a lot last night because I had too many beers in the party.
by Mr. FST September 28, 2013