A simultaneous rusty trombone and ice cream dispenser or hot karl, between 2 people. Also an EP by musical group Yeti on a Budget, featuring the songs Hot Karl and Rusty Trombone.
"I was just planning on a hot karl, but then he started playing the rusty trombone, and when I started dispensing the ice cream, we had a dinner theatre on our hands!"
"I've been listening to that Yeti EP "Dinner Theatre" like all day"
by Zimbabwe May 13, 2004
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A cluster fuck of compromises and half-measures.
"Moving all the way across country and ending up in Hoboken is so dinner theatre." (Also, "Staten Island")

"Windows Vista is dinner theatre."
by theatrewithanRE January 25, 2012
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