Diesel grin

Having a noticeably poor mouth hygiene to the point of blackened and/or rotting teeth, associated to damaging activity like siphoning gasoline from a vehicle or hard drug abuse. See also Meth mouth.
Hey bro, that girls checking you out.
There ain’t no way I’m going near that diesel grin!
by Master Tricon September 17, 2025
mugGet the Diesel grinmug.

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