Top Definition
a crap lake filled with algae and poisonus fish in ohio that hillbillys go out on in the winter when its froze over with there 4-wheelers
(you) lets go to grandlake st. marys.
(friend) why it smells like ass and i dont want to die from the algae in the water
(you) ur right i just cant wait till winter when i can drive my 4-wheeler on it
by SUDDIE August 12, 2011

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