Two men with facial scruff who make out or a guy with scruff licking pussy with scruff. This can also be true for a scruffy ass being licked by a person with a beard (man, woman, or trans). This will likely make one party want to trim up in hopes to avoid the transmitting of bugs.
Synonym: bumper scruffs
Example: two santas playing bumper scruffs on the beach
Hey Mike, when you partook in beard smashing last night, did you avoid his crabs?