An unspoken agreement that the person receiving a rimjob will be clean enough in the backdoor area to ensure that the person giving it will not have to contend with any disgusting tastes.
I gave your mom a rimjob. Luckily, she had rimjob honor; she knew she was clean enough for it be a satisfying experience for both of us.
by The Fourth Man in the Tub September 21, 2011