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noun, meaning a major loser or a screw up. a lemonboy is usually the kid with no friends who sits all alone in his room, studying cars. It can also be used to describe a large mistake.
Emilie: Haha look at that loser playing golf!!
Kyle: oh i know, he's such a lemonboy!

Sara: I just bombed my civics test!
Amanda: same! i made a total lemonboy!!
by suckitlemonhead May 15, 2011