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2.
The term beach party is used for times when a large group of people are all in a bad mood at once. This is called a beach party because it appears that everyone in the group has traved to the beach and has collected a large a amount of sand in their vagina.
"God it was such a beach party at work today, everyone was bitting each others heads off, and the floor was covered in fish scented sand"
by Jared Swartz May 07, 2007
 
1.
Ordering more than one Corona at a bar/restuarant.
Jesse: Hey barmaid, can I get two shots of Jack and a beach party?

Barmaid Sally: How many coronas, sweetie?

Jesse: One for me and one for ol' T-bone.
by The Jouster August 03, 2009