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1.
v. to loiter at the edge of a tour group that you are not a part of in order to overhear, for free, the tour guide’s information

n. a person loitering at the edge of a tour group of which they are not a part
Let's tour barnacle that group looking at Michelangelo's David statue, the guide speaks English and I want to know why David's naked.
by Ephemerratic July 30, 2012