An unwanted person listening in to and jumping in on your conversation
Person #1- "So hey what are you doing this weekend?"
Person #2- "Probably grab a couple a beers and watch the game."

Unwanted Person#3 (listening over your shoulder)- "Sounds fun what time are we gonna meet up?"

Persons #1 and 2 say "stop the grimmering man."
by Mark Stone February 15, 2008
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Two or more, brothers with a surname Grimshaw. Generally have no concept of time or organisation.
Shit me the grimmers are late again.
by baldchimp May 25, 2019
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It is a shitty ass school and all of our sports team sucks
Wow grimmer middle school football team only won one game
by Slacker300 November 23, 2017
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The best place to find sluts, assholes, fuckboys, druggies, and alcohol. If you don't start drinking or vaping by 5th grade you're not cool at Grimmer. It's a school in Schererville Indiana and let me tell you . . . . It's a fucking vape store. Grimmer middle school sucks ass.
I hate that bitch, bet she's from Grimmer Middle School.
by Stein-03-XC January 18, 2018
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