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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
by Penis McGloff September 16, 2006
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3
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!
by GaMeRuInEr April 20, 2006
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4
A term used by stoners meaning "double the high"

or

Lets get twice as high!

see 420
Dude1: Pack another bowl, man
Dude2: Im already buzzin though

*Pause*

Dude1: 840!
by Masta Rolla June 29, 2013
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