Top Definition
Plbt is the noise one makes when they stick out their tongue and blow. go ahead try saying it. It's a rough estimate but it works for the quick response to a stupid comment someone may make on AIM. All credit goes to one stunningly beautiful brunette who is addicted to AIM and has no better purpose in life.
aaronthebomb88: I'm better than you.
toastismyhomey: plbt.
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