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1.
1. The act of licking your fingers in a suggestive (often sexual) way.

2. The act of dipping your fingers in a girl's vagina, and making raspberries while pulling in/out.
Dude- why the hell did you dippyderp in front of me? You're seriously questioning my sexuality....

Second def. example:

Dude, I so dippyderped Jess' pussy last night, though she called me an immature ass later. Oh- here! I recorded it. Dippity dip derp dop doop derp dippity jim jam.
by The Truth of Ippity Erp January 04, 2012