What is third wheeling meaning?

Third wheeling refers to being in a situation where two people who are romantically involved invite a third person to join them. This third person is often seen as an extra or unwanted addition and can feel left out or awkward as the couple interacts. It is also used to describe situations where a person is tagging along with a couple, either by choice or because they were invited. The term is commonly used to describe awkward situations, especially in social circles, where one feels like they are an outsider or an appendage to a couple.