Somebody asked for an etymological summary so far. Not definitive but here's a shot at it. 1) Early 18thc piece of fun/entertainment/game UK (cant expression) RIGDUM, gave rise to chorus in Keemo Kimo/Froggy versions. 2) perhaps derived from 1) US (Maine) musical party 3) rectum derivative. US 4) most common and universal perhaps evolving from 1) nonsense word in song choruses. 5) Knuckle scouring on top of head and related practices, mainly southern US. 6) Welsh Rarebit = Rinktum diddy. 7) Outcome of home engineering, also poss. related--successful fixing of something. East Tex & TN 8) Possibly related to 7) gadget or tool. Ind. 9) An angry or upset state, Nova Scotia. (Latin derivative-rinctum) 10) positive or pleasurable experience, perhaps related to 1) & 2) Mo & Iowa (Aussie-'dinkum'?)
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