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A sucky, wack, retarded, annoying and irritating dude that always be all up in people's businesses.

Leomans usually love skinless pickles and feet that smell like stale corn chips.
Leomans often think they're cool and popular in reality, nobody likes them.
Person 1: Mayne, my girl stole my car last night, crashed into the liquor store and then decided to rob it and they think i did it.

Person 2: Ay, at least that's better than being a Leoman.
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