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a small animal or creepy person that cruises about behind a group of people.
This person or animal is often hard to see and will have no problem mooching off your food and drinks.
"dude, there is a rounger cruising around back in the bushes, i bet it wants to eat our food."

"look at the rounger at the back of the party, he just showed up and didnt say anything to anybody, he is just standing...watching...waiting."

"stop rounging around back there your creeping people out."
by fillupp August 23, 2007
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