Per Urban Dictionary, "An insulting and often humorous name given to the circumferentially challenged among us."
A girl of the non-attractive persuasion.
From mother to child, overheard on the streets of Chicago, "Why you do that? I'm no longer going to call you Sarah. From now on you Pissy Baby." See also Bathroom.
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Running back Rod Smart wore this name on his jersey while playing in the failed alternative football league the XFL. See also Sports.