verb - To bail on your friends to hang out with your girlfriend. It is considered an especially bad case of Lammersing if the Lammerser in question planned the event with friends that he is Lammersing himself, far ahead of time, and then decided to Lammers WHILE AT THE EVENT.
"Why does he keep Lammersing on us? Can't he just tell us he's gonna hang out with her ahead of time instead of Lammersing at the last minute every time?"
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