The placement of one's face, specifically the mouth, into the area between a person's buttocks, followed by a rapid shaking of the face in a side-to-side motion, accompanied with an extreme exhale, resulting in the sound of a two wheeled motorized vehicle. See Motorboating.
So it turns out, Shit Faced and Dirtbiking are the same thing. Heeheehee

Is that shit on your lips or are you just happy to see me?

I've been dirtbiking so long, even Cookie Monster won't eat my chocolate chips.
by Pappa Weird December 30, 2011
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just like dickriding but u can say this out loud in class and not get in trouble by the teacher.

term started in Baton Rouge, La.
stop all that dirtbiking .

hop off that dirtbike.

cool it lil one you could stop dirtbiking.
by dirtbiking August 22, 2020
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The act of shitting oneself whilst wearing tight biker leathers or racing suit.
'I almost crashed my road-bike yesterday, and ended up dirtbiking'.
by McTastic January 26, 2006
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A secret code-word for homo activities between childhood buddies.
"Remember when we used to go dirtbiking together all the time?"
" That was fun. We should go dirtbiking again like we did when we were kids."
by Duff and Brad May 29, 2003
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An off-road motorcycle a.k.a.bike used in the dirt dirt often desribed with numbers (125) wich is the CC (cubic centimeters) of the engine

so dirt+bike= dirtbike
by WILD YAMAHA RIDER October 18, 2003
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A motorized vehicle that is meant to be ridden on the dirt, hence the name "DirtBike."
1) Zach Bazzy is a spode on a dirtbike
2) Clay Varley rides his dirtbike in sand without a paddle tire
by MixMike January 05, 2005
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Known by racers as a dirt scooter, an off road motorcycle used for competition as well as recreation.
K-Dub does the sickest whips on his ditbike.
That goon can't ride a dirtbike for his life.
by JMoney209 March 12, 2006
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