To inject an illicit substance (heroin, et. al.) directly under the skin rather than in the muscle, or the preferred way, in the vein. The result is typically, a small bump. This is typically done because your needle is crappy or your veins are shot. Shooting in the muscle typically hurts, so bumping isn't a bad way to go, and it beats snorting, arms down.
by i April 23, 2003
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