Related to the Smash hit MTV series, 'Pimp my Ride' where dodgy cars as done up in an attempt to make them super rides.
In general terms this refers to an individual doing up/Pimp'in Out (a car), i.e. new stereo, new exhaust, new paintwork, body kits, etc...
by Tim Grinder October 1, 2006
Get the Pimp'in Out (a car)mug.