Bopper

One who enters a gathering of two or more individuals and does not actively add to the conversation. The individual may leave soon after arriving.

Anyone can bop, but permanent boppers tend to be an annoyance.
Mackenzie always comes over to my circle of friends, awkwardly stares at us for 2 minutes and then leaves. She is such a bopper!
by Bopin' Carl May 10, 2011
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