One Trick Pony; is used to describe a friend, acquaintance or stranger, who has very few talents, sayings, jokes or skills.
you're such a one trick pony!
by A J C April 05, 2006
someone with only one talent, accomplishment, etc.
He has only ever been in one movie. He is a one-trick pony.
by The Return of Light Joker January 12, 2008