an individual who focuses way too much on a particluar person. The word comes from monogamous.
MIKE -- hi glenn
GLENN -- hi mike. Have you seen Sara?
MIKE -- Are you still thinking of her?
GLENN -- She's the only one for me.
MIKE -- Glenn you've become a monog.
GLENN -- I have?
MIKE -- Listen to your heart dude, the world is full of beautiful people who need love.