The act of ejaculating onto a plant, and then giving it to someone as a meal.
Man-"Last night I saw Jim herp on a plant, and later his wife was derping it!"

WomanA-"I love herp derping!"
WomanB-"Me too! It's so tasty!"
by CaptainYuri April 6, 2011
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The opposite of Herp De Derp. Something you say to counter Herp De Derp.
Man - I just banged your mom
Woman - Herp de derp
Mom - Derp du herp.
by DerpMaster1234 November 22, 2011
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