Also, weed contrail. The odiferous trail left behind an automobile in which significant amounts of smoked marijuana is being consumed.

From weed, slang for marijuana, and chemtrail, a conspiracy-theorist's variant on contrail, the condensation trail left behind by a jet airplane at high altitude.
Dude, did you get a whiff of that Lexus that drive by? It was leaving a serious weed chemtrail.
by x Chicagoan April 21, 2017
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