A stoner activity wherein one consumes copius amounts of ganja, ganja extract, edibles infused with either, or any combination thereof, and then consequently proceeds to drive at noticably slower velocities due to the effects of said ingested products, meanwhile experiencing the sensation and subsequent rush of driving extremely fast, as though being a NASCAR racer.
The pot head may "tune in" to increase the feelings associated with Hashcar Racing by turning on music including, though not limited to, Asian dub, house, club, swing, folktronica, synergy, neurofunk, cybergrind, thrashpunk, trip-hop, and spacesynth.
Although Hashcar Racing is not considered dangerous because of the slow velocities inherent, it may become hazardous if combined with "hotboxing" since the driver's field of vision and occular clarity may be decreased by the smoke cotained within the automobile.
Hashcar racing is considered a sport by a small percentage of reefer tokers.
Though the sport is not recognized as an olympic sport, it does have a worldwide yearly competition on April 20th called "The Great Space Race."
(as a verb)
John: Why is that dude going so slow? It's a 55mph zone!
MaryJane: He must be Hashcar racing.
(as a noun)
MaryJane: I hate traffic!
John: I don't mind, I just light up a slpiff and transform into a Hashcar racer.
(as an adjective)
John: I just got an ounce of some dank Collie Buds, what should we do?
Mary: We should take your Pinto to the burbs and get all Hashcar Racey on the side roads!
John: What a novel idea! I'll grab the zig zags!