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1.
A person who, when feels uncomfortable in a social situation, will pull out his wiener and start to eat all wieners in sight. After which, he will begin to slap his own wiener while throwing anus pie's into his own anus.
Greg: I heard that Jim is a social wiener-nibbler
Jim: Yeah he's always been a li... WAIT I'M JIM
--Jim pulls out his wiener and starts to eat Greg's wiener while throwing anus pie's into his own anus--
by The Cat-Slappin Beef-Choad June 02, 2010