A maggoty, spoiled, lil' bastard who does nothing but whine and bitch a terribly lot, annoying you out of your mind. (usually referred to as "little sister" or "baby brother")
Little Sister: (in the middle of a VERY crowded mall) I want candy! (starts crying) WAHHHH! GIMME CANDY NOW!

You: (looking through some XBox games) My, just shut the f*** up you stupid little BRAT.

Baby Brother: (starts crying for no reason at all) WAAAAAAAHHHH!

You: (listening to music) Quit bitching and shut the f*** up, you brat!
by stupidoldman April 10, 2009
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A relatively recent development in the BDSM community, a brat is a woman who suggests she is ripe for a submissive sexual encounter, but diliberately and flagrantly torment prospective doms. Brats often dress like young girls, sport Catholic school uniforms or dress like Bratz dolls. Often they band in packs and suggest there is immense pleasure available from the group for the right (and lucky) dominant male. Males must "prove" their dominance to the satisfaction of the group. Most serious BDSM practioners put a premium on total honesty and trust and thus the brat phenomenom has not been welcomed by all.
The seductive brat in the corner were trying to cocktease Sir Robert but he wasn't buying it.
by Bill Peters July 29, 2006
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A spoiled rich kid with an obnoxious or bitchy attitude. Can be male (though is most commonly female), and coincide with bimbo and/ or valley girl stereotypes. Often found in a high school or college setting, commonly in groups or cliques led by a Queen Bee/ Alpha, and frequently engage in bullying. See also: Mean Girls
Zeke: Looks like the popular kids are tormenting the nerds again. You going to their big pool party at the mansion?
Skyler: No way I’m missing a chance to hook up with one of those brats!
by Equinsu ocha December 27, 2020
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A girl/boy who needs a good spanking.
Jon:"My girlfriend has been such a brat lately"
Joe:"do what I do, give her a spanking"
Jon:"That could be fun"
Joe:"Yeah, it'll work too"
by brattyyy October 20, 2010
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Someone who stands %100 for Cher Lloyd.
Brat 1: Do you like Cher Lloyd's music?
Brat 2: Yeah, I do.
by CataHoran December 06, 2012
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someone that drive you crazy and never goes when it is there turn but you just cant get enough of them!
courtney yost is a brat!
by brownbuckeyes October 30, 2011
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