a belt or strap in an automobile, airplane, or other moving object, fastened around the midsection to keep the person safely secured, as during a sudden stop or massive wreck.
Miss KC Slinger hopped in her whip and made sure to buckle her safety harness before cruisin down 95, yes sir.
designated rider. The designated driver may be important to a night of debauchery, but the designed rider takes one for the team by sacraficing himself to having a good time. He/she can be found shouting profanity at other drivers and pedestrians while the designated driver does his/her best to contain them in their vehicle.
Pass that bottle of Captain Morgan, Dr. Doug E Fresh. Tonight, I'm the DR.