Top Definition
a person awkardly there in a situation with a couple.
sarah and joe were fooling around behind the building and maggie was with them. she was so awkward, being the 3rd wheel.

laura: were you the 3rd wheel?
maggie: yeah i hate it. i always get stuck with that when they are being so couple-y.
by used and thrown away December 05, 2009
an extra person in a social venue, especially one tha interferes or gets in the way
Go away! We don't want a 3rd wheel with us.
by The Return of Light Joker October 19, 2009

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