a word used to describe somebody who pisses you off, is extremely annoying, snores while they sleep, ect. in general its a word that you use to call somebody if they do something you don't like
Joey: Do u know who used this pot for mac and cheese last? Its dirty.
Matt: Yea I think it was Tom. What a rat.
Matt: Yea I think it was Tom. What a rat.
by mattfofatt01 December 15, 2007
by Ratubaga May 09, 2022
by sxsos December 14, 2015
by AverageDude6900 July 17, 2020
a fake friend or someone who isn't loyal
"Wow I can't believe Kimberly is friends with those rats! They don't even know the definition of friendship or how to treat friends like they deserve."
by jiminyougotnojams January 01, 2017