Top Definition
Where a one-upper tells you a bigger and better story, usually by making it up, a Legitimate One-Upper doesn't make anything up because they really are bigger and better than you.
Player: Dude, you see those girls over there? Yeah. I totally banged them last night..

Rich Player: Oh them? I did them last weekend. And their sisters...

Player: *Mutters* Damn, you Legitimate One-Upper...
by KtotheQ May 22, 2010

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