A moped is a person you are having fun
dating, but would never want your friends or family to meet because they are ugly or a total
loser.
Like a moped your date is fun to ride, but you would never want your friends or family to see you on it.
I've been
seeing a girl for several months, but I can
never introduce her to my friends or family because they would make fun of me because she is a
total moped.