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1.
To be tricked, decieved or outdone. To be imbibed with false accountancies of produce.
Person 1: Hey guys i just got a Mars bar for 70p from the shop.

Person 2: They're 40p next door man.

Person 1: Really?

Person 3: It seems that you've been diddled my friend
by SummerOnions March 27, 2009
 
2.
The act of inappropriately touching a person under the legal age of sexual activities. Usually performed by Fry Shapland and Jay Inglis. Can be done in any occasion and can also be related to Paedophilia
Jay: "Holy shit did you hear about fry?"
Kaycee: "No, Jay you handsome fellow to tell?"
Jay: "Apparently he diddled the hell into an entire Orphanage"
by Not Big Jay January 30, 2011
 
3.
to be raped by a dinosaur, preferably a t-rex.
Yo man, I was walking home from the subway station last night and I got diddled by some guy in a Barney costume!
by jammer2500 September 16, 2008