When you are asleep andw useless, like a lamp with a broken lightbulb.

Used as a substitute for other verbs, adjectives, and nouns.
Guy One: "Where's Casey?"
Guy Two:"He went lampmode on us."
Guy One: "What a prick."

"Dude! Did you see that dunk?"
"LAMPMODE!"
by lampmode May 10, 2009
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