To have a cold lamp is to be insufficiently high from a drug, particularly after having recently been sufficiently high. A coke- and/or crackhead with a cold lamp is one who hasn't had another line or hit recently enough, or took a bump or hit of insufficient quantity. Can also be used as a verb.
"Yo, how's your lamp?"
"My lamp's cold, man, real cold. I got a real cold lamp over here."
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