1. The result from eating to much anus.
2. Referring to someone who is being a major dickhead.
3. Used when jokingly calling a friend/acquaintance.
1. "Come on Dave, everyone knows what beigemouth is. It's when you eat too much anis!"
2. Yanni plays some facking terrible music, no wonder, it comes from his beigemouth.
3. "Yo beigemouth, pick me up a 24 of Sexport."
by Big Toker April 26, 2003

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