Top Definition
When there is a couple together, and one extra person there without a date, so they are 'third-wheeling' the couple.
Mary: You and Your boyfriend (Jack) go to the movies together.
Wendy: It will be boring without you though, can't you come?
Mary: Only if we invite another person so Im not a third wheeler
Someone who dedicates their lives to a couple by being single and hanging out with them.
Do you see that guy following that couple over there, yeah well he's a third wheeler.
by BobbyExDeeDee September 12, 2015

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