Top Definition
An annoying person who hovers over you on a train, bus, or on a plane, and constantly coughs and/or sneezes on you. "Level 5" refers to the highest level of biohazard in a "hot lab".
I'm trying to stay away from the walking Level 5s on the train, because I have no sick time left at my job.
by pentozali November 08, 2005

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