commonly makes the person who is third wheel'd angry but they cant say anything at the time of the incident because you don't want to make a scene in front of your friend's girlfriend/boyfriend. mostly argued about with friend who third wheel'd you the next day.
Man 2: What does that mean?
Man 1: When Jimmy invited me to hang out at his house last night he didn't tell me that Ashley would be there too. So then i became the third wheel and had to sit there while they snuggled and made out.
Man 2: That sucks. Jimmy's a dick sometimes.
Don: James what the fuck! why did you fucking do that last night?
James: do what?
Don: you fucking third wheel'd me last night! you invite me to your house to play xbox and instead you have amanda there and i was the third wheel and it was awkward as hell!
James: oops my bad.