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smarty
smarty pants
1. One who obnoxiously and frequently attempts to assert perceived superiority in intelligence; a know-it-all. Don't be such a smarty pants. You don't know everything.
2. One who makes jokes and uses sarcasm in an attempt to seem witty, but instead is deemed annoying; a smart aleck. OK, smarty pants, are you going to help me, or just stand there mocking me all night?
a smarty pants
(informal) someone who is always trying to seem more clever than everyone else in a way that is annoying Cindy, the little smarty pants, will be the first to tell us where we went wrong.
smarty
n. a cocky person. (Also a term of address.) Well, if you’re such a smarty, why aren’t you rich?
smarty-pants
n. a cocky person; a smart aleck. Look, smarty-pants, let’s cut the clowning around.