Top Definition
You know when teachers tell you to stop the PDA? The Public Displays of Affection? Well this is somewhat like that, except it stands for Public Displays of Undergarments. If you know someone who has already been attacked by this disease, please, just yell at them like this: "Hey! I can see your panties/underpants!"
1. Sheesh, keep your pants on.. or else we might have some PDU on our hands.
2. 'Can you stop this PDA business?' 'Can you stop your PDU?'
3. PDU? What the fizzle are you talking about?
by Jeff November 04, 2004
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