1.NounAn action or stunt where a bicycle, motorcycle, or other vehicle is ridden for a short period while it is standing only on its rear wheel or wheels.
"Jim fell off his bike when he was trying to do a wheelie."
2.NounA wheelchair user.
3.VerbTo ride, or perform the stunt of riding, a vehicle on its rear wheel or wheels.
4.AdjectiveAlternative spelling of wheely (“having wheels; mounted on wheels”).