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1.
To slightly bulge through something.
"I could see her pussy protruding. ^.^ "
by Dave September 23, 2004
 
2.
To drive your car in such a manner as to invite a street race, especially in another area that is commonly known to be ruled by another particular car. Used by gearheads.

also: protruding, protruder
Hey man, that Mustang is totally protruding in Jimmy-Z's turf, where is he?
by ghost July 31, 2003