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Abbrieviation for Bring Your Own Place Mat - when inviting people to your Doc Browning party it is considered very couth to remind them to bring their own supplies for ass spelunking. If they don't they will have to use your spares, which is like using the Foot Locker socks
Chelsea forgot her well loved hamburgler place mat to the widely anticipated Doc Browning party, even though her invite kindly requested she BYOPM. She was forcibly ejected.
by ChampUnkind November 02, 2016
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