A Regular Comedian

Since you were in the womb I would say "He's really funny..." and now, over a year and half later we still think you're absolutely hilarious! Dad and I will ask you "Can you tell us your best joke?" and with out fail you say "Diggle Dat!"then tilt your head back and laugh! No matter what or whom you tell the joke to it's always a variation of "Diggle Diggle Dat!" It makes you, and anyone listening laugh every time! A funny man you are! But we are still trying to figure out what "Diggle Dat" is.