A beard which girls find unattractive that a man grows when his girlfriend, who normally would make him shave, goes away for a long time. The beard repels other girls and thus ensures the man’s chastity.
Jake: What's that disgusting thing on your face?
James: That's just my chastity beard.
Jake: Oh right, your girlfriend is on vacation.
James: That's just my chastity beard.
Jake: Oh right, your girlfriend is on vacation.
by Hopeyouguessmyname May 21, 2010