Top Definition
In a group of 6 friends, the only person who is not in a relationship. (The 5 friends and their partners + 11th wheel = 11) This character may be known as lone wolf, the bachelor, the free man. Most likely the coolest of the group, too cool for the opposite sex. The 11th wheel does not in anyway care that he/she is the 11th wheel. He/she's cool with it. Really fine with this.
Luke is an 11th wheel.
by Iamnotlukeipromise December 21, 2010
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