slug
n.— «On a lonely corner, the kind of corner you don’t want to be alone on, stood a woman. In a late-model smallish SUV drove another woman, looking for slugs. In Metro parlance, slugs are people who ride with bodysnatchers instead of paying full fare on the bus. Bodysnatcher are people who snatch bodies off of Metro busses and take them home in their car so as to be able to use the HOV lane.» —“A little perspective, please!” by Stephanie Davis Chron.com (Houston, Texas) Apr. 10, 2006. (source: Double-Tongued Dictionary)