| Misfit |
| Useless person |
| Double-date extra |
| Unwanted tagalong |
| Superfluous person |
| Unnecessary person |
| Superfluous individual |
| Superfluous participant |
| Person with two couples |
| Odd man with two couples |
| Unnecessary person, on a double date |
| Useful type of hitch in a pickup truck, or an undesired part of a social circle |