Interloper

[Sarah]

One who interlopes; one who interlopes; one who unlawfullyintrudes upon a property, a station, or an office; one who interfereswrongfully or officiously.The untrained man, . . . the interloper as to the professions. I.Taylor.

[Sarah]

Any individual who intrudes or does not belong- in a conversation, at a social gathering, or anywhere else. First popularized by Malachai, of Children

[Sarah]

The friend that moves in on the guy who's talking to you at the bar. She thinks she is the cutest of the group, and therefores feels entitled to any man, attractive or not, particularly if he's talking to someone else.

[Jessica]

someone who becomes involved in an activity or a social group without being asked, or enters a place without permission:

[Sarah]

A person who becomes involved in a place or situation where they are not wanted or are considered not to belong.