To bench press 225lbs. The weight is comprised of an olympic bar and 4 - 45lbs plates, also called "wheels"
-what did you bench today?
- I was four wheelin
by TidalEPC March 13, 2013
A woman whose on all fours and ready to go!
That bitch looks like she'd be down for some four wheelin'.
by d1s2c3s4 February 27, 2009
Butt sex. When a guy sticks his penis into a lady's ass hole. The penis usually ends up covered in poopies and generally quite dirty. this is where the expression comes from. Cuz usually if you go 4 wheeling in the backcountry, your car will end up covered in mud. Mud resembles poop and the car is a metaphore for your penis.
Female Infidel: OMG! Timmy was so horny last night but i was on my period. I let him go four-wheelin in the backcountry. It smelt like poops and now i cant control my sphincter so i wear a diaper.

Infidel: I went four-wheelin in the back country yesterday. Ass hole is the second vagina.
by Mahmoud Amidemajad March 26, 2008