Top Definition
meaning a boy's coming on to you and you don't like it. you say it to your friend so she makes a distraction or a reason to leave the situation.

first originated with the phrase 'tampon' but then changed to 'lamp's on'.

this phrase is very useful for avoiding unwanted situations.
guy- "hey sweet cheeks"
girl- "lamp's on! lamp's on!"
friend- "come on, girl. let's dance. ;)"
by charlotte silver August 07, 2008

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