1 definition by mgilly

1. Offensive term used to describe the mentally and physically challenged; slow witted, uncoordinated, stupid. retard downie

2. The name of Kiles band in South Park
Ex. moop-ball - A way to describe the quality of a sporting event. Co-ed softball can also be referred to as "Moop-Ball" because the quality of the game is so poor.

Ex. After your third car accident in a year your driving skills can be described as moop-ish or moop-like.
i.e. You drive like a moop!

by mgilly August 23, 2007
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