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2.
A pair of pants worn by a male that are extremely tight.
Dude, nice Plumb Smugglers. I can count your pubes through those things.
by The Hutt August 25, 2010
 
1.
usually referring to tight underwear worn by a well hung male
his underwear was so tight i think hes a plumb smuggler
by mr.m dog September 23, 2009