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Someone who is tricked into smoking lawn clippings instead of Mary Jane(marijuana) yet believes they are high af
Person 1: "Hey Eddy, how high are you?!"

Person 2: "About 8/10"

Person 1: "You do realise you just smoked grass?"

All others present: "GRASSMAN!"
by PREDDDDDDSTERT April 13, 2015
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3
Following the same principles as a snowman a grassman is moulded out of freshly mown grass clippings
Tye and myself made a grassman today on his nature strip
by A-Lex (Just One) June 23, 2007
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4
A person associated with weed
As a grassman himself, Ben likes to hang out with the other grassmen, as he can get a solid weed supply from them
by Dongflop July 31, 2018
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