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1.
Sayings or other oddities expressed by Keith Hernandez (the former 1st baseman for the New York Mets).
-"That's an el bomberoni!"
-Well that's a Keithism; if I ever heard one.
by 5Mets7 May 22, 2011
 
2.
the religious ceremony of fucking mooses every day
George-"Dude, why did you buy a moose?"
Bob-"It's for this new religion of keithism! You should join!"
by Brett and Nick April 27, 2008