to mutter, mummble, or talk under ones breath.
max: hey jimmy whats up?
Jimmy:😒
max: dude dont grommel speak up!
jimmy: I said.. not much you?
by pentione February 05, 2014
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"Hey, have so seen the new Walter and Grommel?"
"Da, I like when he said 'Got chese?', haha"
by NotPeterCrouch July 15, 2020
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