singlestache

The mustache you shave either right after or right before the end of a relationship to symbolize your new found independence. Also can be used a flag to show that you are not ready for another relationship.

1: Did you see Bob's singlestache?
2: Yeah man he must be about to break up with his girlfriend.

or

I'd totally go out with Bob but he has that silly singlestache. Maybe I'll ask him out when he shaves it.