Etymology: TV sound effect with possible origins in the comedy series "Bewitched" (ref. Samantha's nose twitch). See also entry #1.
Alternate spelling: Diddle-liddle-it
Buddha: You must walk quietly away.
Ego: Argh, there's only one thing for me to do with these last drops of vital fluid. I'm gonna sock it to him. Tell him off and cut him out. And I'll never regret it!
It is often followed right after firm statements like "that'll never happen" and it's in place of familiar sayings "cut to" or "fast forward to."
In cartoons there's that specific sound effect used to imply the passage of time——-like when the calendar pages flip, or the newspapers spin around. It's purpose is the same if the outcome is ironic. You're jumping ahead to the next scene when the "unthinkable" just happened and it turns out someone's an idiot.
You could probably use this every time, after Homer Simpson speaks.