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1.
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."
by Boblowlaw June 21, 2006
 
2.
to shut down. take something that's hot/fun and kill it so it is no good/fun anymore.
this was a great party until tiffany came and coldlamped it.
by B from LBC October 15, 2007