False economy

False economy; is used to describe something that may initially appear fantastic from the outside but does not live up to expectations.

A girl wearing a wonder bra! that's a false economy!

by A J C April 25, 2006

One Trick Pony

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 23, 2006