A glistening residue of spunk or semen which collects on the top lip of an adventurous individual post fellatio. It is not unusual for the residue to run down the sides of the mouth thus forming a striking resemblence to a glistening handlebar moustache. The word is more commonly used today to refer to the
milky residue left after consuming a foamy or creamy drink
like a cappucino of
milkshake.