An uncool person who acts annoying, weird, or childish. They also seem to lose a lot in life.

plural form - loserpantses.
He didn't even return my call - what a loserpants!
by SarahOfKrypton July 15, 2006
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An uncool person who is a freak, socially inept, awkward, nerdy, and generally a loser, even if he thinks otherwise
Peter usually just sits there awkwardly; he's such a loserpants!
by ssshhhh March 19, 2008
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Plural form of "loserpants", used to describe two or more people who can be qualified as being a loserpants.
"Don't worry about it, Jill. All men are loserpantses when it comes to women. They can't help themselves."
by bann July 2, 2008
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“You are a loser!”
Oh yeah, well you’re a loserp!”
by Mimamaesfea April 5, 2019
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