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1.
A condition where one consumes mass quantities of sugar and junk food leading to immediate sugar rush and evacuation of bowels. Has been known to cause sharting.
"Every time I eat at Chili's I get diarrhetes."
by J Skids August 03, 2009
 
2.
Similar to how one can get Diabetes by consuming too much sugar, one can get Diarrhetes from consuming too many diuretics such as coffee.

Symptoms include uncontrollable diarrhea and surprisearrhea.
Trevor: You don't look so good.
Jerry: I just had 3 coffees and now I think I have Diarrhetes!!!
by FrylockMastershakeAndMeatwad September 12, 2011