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1.
When you rub syrup on someone's nipples

Originated from a Youtube video entitled: YTP Michael Becomes Increasingly Explicit
When i was 7 i rubbed syrup on my sister's really big nipples fiddle diddle riddle diddle !
by nick shredder June 17, 2011
 
2.
Slang for a man's private part.
Also used as an insult
You have a BIG fiddle diddle.
You fiddle diddle you screwed me!
by Fun Yun Rider January 05, 2011
 
3.
any sexual expirence with another person
bob fiddle diddled brittany behind jessica's back.

joe and megan were fiddle diddling in the back seat of joe's car.
by audyy July 10, 2008