Someone robs a liquor store. The clerk tells them they are not old enough to steal/buy the alcohol and then asks for an I.D. Being an idget, the thief obliges.
A bothersome person who might be considered of little consequence but will simply add to a fucked up day... sorta like a didget only less than countable where meaning counts.
The word can be considered a mispronounced form of idiot.