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1. Dirt Biking
When you stick your arms out in front of you as if you were dirtbiking, then pretend to ride a dirtbike by running around and making loud and obnoxious dirtbike sounds at the top of your lungs in a public area. May be accompanied by dirtbike gear. Usually, a bout of dirt biking is accompanied by wipe-outs, where you do a spectacular crash and make sputtering sounds. Afterwards, you can pick up the bike and do a sweet wheelie to get out of there.
Guy 1: Man, did you see that plank I did?

Guy 2: Planking? Everyone knows dirt biking is where it's at!

Guy 3: Ya, I just went dirt biking in Wal-Mart!
2. Dirt Biking
When one person lets there asshole get all disgusting and dirty, then another has butt sex with them (usually done messy)!
1) Dirt Biki- My ass feels so gross, but it will be worth it tonight when I get dirt biked!

2) Dirt Biker- Man I can't wait to go dirt biking tonight.

(friend) -Wow, thats pretty sick.
3. Dirt Biking
verb When a male rubs his dick on a girls ass while she proceeds to have diarrhea.
Betty and i were dirt biking so hard last night that the dirt splattered everywhere!
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