When you are out with a friend and a group of his friends, who you aren't well acquainted with. This put's you in the sidecar,(as in motorcycle sidecar) your friend is driving and you are awkwardly along for the ride. with nothing to control or keep you occupied... (beside your nerdy cell phone). And the subject of the group conversation turns to something you have no clue about, (Inside jokes, Old school/work stories) It's hard to look cool in the sidecar.
Man! I went to a party with Mike last night, there was a bunch of his old highschool buddies there.
Mike and his buddies started talking about their favorite rugby teams, I have no clue about rugby. I got put in the sidecar!