Originated in Toronto highschools back in the late 70s as being the "safe" time to spark up.
School gets out at 3:30pm, takes about 45 minutes for general student population and teachers to leave the premises; this gives you time to hang out for a bit and to roll a few fatties.
Fuck man!...it's 4:20...spark'er up. Whattaya waitin' for?
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