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1. herpa derp
Used to express the stupidity of a given situation.
You put the bread in the fridge? Herpa derp.
2. Herpa derp
Visible, oral Herpes on a hood rat (hoodrat can be either female or male, as long as the person has participated in hoodrat like activities).
"That bitch Liz got the herpa derp from daniel."
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