Someone who smokes alot of weed daily. You see them frequently and you can smell their presence when their around hence calling them the "Grim Reefer".
Fred to Ethan after math class: "Dude I could smell the Grim Reefer behind us...dude likes to light up before class every day".
by noyoudontknow February 7, 2010
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1. The one friend that can outsmoke any day at any time. 4/20 isn’t a holiday for them, because it’s everyday. They’ll die before they quit.

2. The lung collapser. The hit that gets you coughing so hard you think you’ll pass out. You’re drooling, there’s snot dripping from your nose, tears are falling, you probably gagged a bit. The kinda hit where you know you fucked yourself over the second you inhaled.
1. “Dude did you see they invited josh to the rotation? The Grim Reefer is upon us.”

2. “I took such a crazy rip from the bong I thought I was gonna die man; it was a Grim Reefer for sure.”
by carkeyscart May 11, 2023
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