1 definition by Soulaja Boy

To insert one's finger into the asshole of an unsuspecting female who has passed out from consuming alcohol;

The preferred location to perform a neidermeyer is in a moving vehicle with an ample amount of spectators.
Guy 1: I got tired of that shit.
Guy 2: So what did you do?
Guy 1: I neidermeyered that hoe!

Girl 1: My asshole feels weird. It is as if someone inserted a small object up it.
Girl 2: You were probably neidermeyered last night.
by Soulaja Boy November 8, 2007
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