Barnacle

An individual (or individuals) whose presence is constant, annoying, unwanted and, most of all, seemingly impossible to free oneself from. The best way to avoid a Barnacle is by way of a "Barnacle Alert," typically administered by SMS or similar technological means. This serves to warn the recipient that a Barnacle is in the area and to steer clear. Barnacles are notorious for flouting the law, so overall it's best to steer clear of them.

"Oh, man, I can't believe you got stuck with the Barnacles last night!"

"Wow! You got Barnacled last night?"

"Can you believe the Barnacles turned up tonight?"

"Who did they Barnacle this time?!"