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 contrail, the condensation trail left behind by a jet airplane at high altitude. see also the conspiracy theorist's variant weed chemtrail.
The crew in that car must be very high - it's leaving behind a weed contrail.
by x Chicagoan April 21, 2017
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