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1.
Grubes are gray pubes. Specifically found among very old aged humans.
Timothy: What the fuck is that smell and what the hell is stuck in your teeth?

John: That would be your grandma and some of her grubes.
by Taco Bandit 87 June 26, 2011
 
2.
To have sex without consent, a.k.a. rape
Back in my day, girls were never grubed. they were raped.
by Caesar March 17, 2004