Justin was so trashed in the Las Vegas Airport after a weekend of partying that security deemed him "unfit to fly" and he had to be wheel chaired out of the airport.
A wheelchair buddy is one you will go to the same retirement home with where you will sit around all day playing bridge, talking about old times and racing each other down the hallway while having a laugh.
Predominately used to refer to 4x4 ATVs but may refer to any motorized off road vehicle (i.e., snowmobile, sand rail) which allows non-athletic couch potatoes to get into backcountry places they typically would never consider getting to through their own physical exertion and exercise. Likelihood of driver being from Texas is disproportionately high. They are particularly found in the mountains and deserts of Colorado, Utah, Oregon, and California.
The term is often used by real outdoorsy people as a sign of irritation and disgust. See below examples.
Did you see what those assholes in the Texas Wheelchairs did to our favorite hiking trail? Why don't they just get off their fat lazy asses and walk or bike up here?
A gent who is perpetually horny, lascivious, concupiscent, goatish, lustful, hyper-sexual, lascivious, lecherous, lewd, libidinous, licentious, lubricious, oversexed, randy, salacious and satyric. He will literally bang anything which has a cavity, even if such cavity happens to be on a wheelchair.
John: Paul did it again yesterday. He banged poor old Katie in the parking lot right in her minivan... in the fucking handicapped parking space.
Mark: OMG what a fucking pig! How the fuck did he manage to get a boner?
John: Nah man you haven't heard the best part.. While ramming her raw, he kept making handicapped noises.