1 definition by jordanski

Top Definition
Someone who needs to be better than you because of there insecurities. No matter what you say about anything they will top it.
Say Alec the great tells a story about saving one little panda cub from a three alarm house fire. Dominguez the "one upper" will then tell a story about how he saved Panda's from dying from extinction.
by jordanski April 07, 2008

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