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1.
When girls have parties and dance crazily to music, usually popular music.
Caroline and Jordan have bra parties when they are hyper.
by victoria secret lovers June 13, 2009
 
2.
Social occasion where young ladies sit around a lounge room of one of their homes wearing and removing their bras, trying on each others bras, and discussing the future of bras.
Jodie was invited to a Bra Party, and was so excited that she decided to bring along a whole heap of her bras for her friends to try out.

Samantha invited half a dozen girls to hang out at her home on the evening so that they could compare bras.
by Sean the pervert August 29, 2008
 
3.
when girls parade around in their bras acting crazy, dancing to fun music and talking about boys
mimi's intire life is a bra party
by 2cool2bforgotten August 15, 2010
 
4.
"Bra Party" can be used to identify a band or a song that is usually heavy metal, rock, metal, or hard rock. comes from pictures of girls at my school having a party half naked that everyone found. It started as describing a song as "hard" then someone said "like my dick" and someone else interjected "after looking at the bra party pics!" so bra party was invented
Person 1: System of a Down is pretty hard!
Person2: Definitely, they are a Bra Party band
by 1337beanz December 09, 2006