Kevs laundry is an alternate way of referring to any type of drug / narcotic. Derived from a night out in Europe, when a house party was hosted by the legendary Kevin, being invited into the laundry out the back, behind a washing powder box to get high on his supply... Kevs laundry was born.
Bro, should we get some Kevs laundry tonight?
Yeah dude, keen.
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Might sneak out the back to catch up with Kev, interested?
Yupp