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slang A clasp, clamp, or other similar fastener, especially an alligator clip, used to hold the end fragment (the "roach") of a marijuana cigarette (a "joint") while it is being smoked so as to avoid the smoker's fingers getting burned. He makes fun of me for using a roach clip, but I had the last laugh when he burned his fingers and dropped his roach in a puddle.
roach clipand roach pick
n. a device to hold a roach and make it smokable. (Drugs.) When the cops find a roach clip on you, you’ve had it. He held the roach on a paper clip “roach pick.”