A meaty, all encompassing, time-killing bowel movement. Usually so large that it fills the toilet bowl. Afterwards it feels like you cleaned out the deepest recesses of your colon and intestines and the bathroom has the stench of dead cross eyed clowns.
"Yo bro, gotta watch the show let me know!......Oh MAN! I gotta take a shizzle grizzle bro."
Tammy: "Tim usually prefers the finest postmodern toaster ovens. So, I was trying to choose between eggshell mauve and peagreen pastel when all the sudden I felt a shizzle grizzle brewing in my bottom. Oh dear."
Spoo: "What're you doing in there?"
Steve: "Taking a MONSTER shizzle grizzle!"
Another way of saying grill except ghettofied by putting the 'izzle' like in fo shizzle my nizzle and the biscuits were added on to make it stupid-funny
In response to the "Cougar" nomiclature to describe a thirtysomething women on the prowl for younger men. Grizzley is a term to describe a thirty to fortysomething greying, probably devorced, man on the prowl for some younger ladies. The Grizzley often denotes pity from younger folk because it is clear that their time has long since past.
Robert Blake, Tom Arnold, and anybody hanging out at a TGI Fridays bar on a wednesday night in anytown in the USA.