"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
when a girl wearing a skirt is sitting on a chair or something and you can see a little piece of her panties/ thong/ g-string between her legs (usually on the area right above the pussy) these are like those paint swatches at hardware stores, a sample of what you can get.
Guy1: oh shit! you can totaly see the swatch on that chick!
Guy2: ya she totally has a swatch showing.