(pronounced as: Grr and Rim put together) It means ugly or an ugly person. It can be used as a Noun or Adjective.
Mom these clothes are grim.

OMG look at that grim!
by Kendal58 November 2, 2010
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"Nigga where the money" "who you getting grim with"
by Mr.Detroit March 4, 2010
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A loud person that has a primal fear of condiments and sauces.
Named for the Alec Baldwin like grimace that a Grim Grim Baldwin will make if their food is prepared with condiments.
Fast food worker: Here is your order.

Grim Grim Baldwin: What the hell is this? Why is there ketchup on my burger? This is completely uncalled for!!!!!
by Mchate April 22, 2008
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this expression is used to show somones deap stupidity and love for chickens
'your such a grims'
'Hey chicken want to go for a grims'
by mystic midget June 25, 2008
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Yo, those fucking Air Twos are grim as shit, son.
by JayR June 21, 2004
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An androgynous senior citizen who’s appearance forces you to wonder - is that a grandma or a grandpa???

The geriatric version of a “shim” - is that a she or a him??
Susan was cursing out the slow driving grandpa causing traffic, but when she finally passed them she realized it was a grim.
by Dirk217 May 10, 2019
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The name of a strange and very shizophrenic dude with a very big profile neurosis; mostly appearing in internet chatrooms and talking nonstop nonsense while listening to total absurd music.
"Hi, it's me, Grim." - "Oh, no, the bullshit goes on again, go away!!"
by grim13 April 11, 2005
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