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.