1. A slang name for Genesee Cream Ale with it's origins in Western New York.

2. The resulting painful diarrhea, and intestinal gas buildup hot enough to cut steel that sometimes results from drinking Genesee Cream Ale.
"I shouldn't have drank all of those last night. I woke up at 4AM with a serious case of the Genny Screamers..."
by OsirisAscending January 13, 2012
Hideous units of flatulence prevalent after drinking Genesee beer.
A good policy if one is suffering from the "genny screamers" is to simply avoid the public altogether.
by franc63 September 7, 2010