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4 hours and 20 minutes after 4:20, just in case you forget to hit the blunt and don't want to wait an entire day
Me: Dammit, I just missed it!
Friend: What?
Me: 4:20! Now we gotta wait all the way until tomorrow!
Friend: No you don’t, just hit that shit at 8:40!
Me: Oh yeah!

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You type this when you have way too much free time or are way too bored.
Teacher: lets count to 50!
Students: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50!

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To inhale and exhale the fumes of burning cannabis plant material at a rate approximately double that of the average consumer (see: 420)
Neophyte: Excuse me, my good stoner, but how, specifically, might one "840"?

840 Veteran: JUST SMOEK WEEED TWICE AS HARD!!!!111
840 by Penis McGloff September 18, 2008
Like 420.. But double!
Micaele: Holy shit boys, it is 840! Let's get twice as high!
840 by DON COLAMECO! June 13, 2007
A blunt so large that it is considered to have double the capacity of 420.
He rolled up an 840 and smoked the whole damn thing in an hour and a half!
840 by GaMeRuInEr May 2, 2006