Top Definition
A man-boy monster that lives on the west end of the city of Florissant. He is rumored to have grown a full beard at the age of 14 and has released 14 triple platinum rap albums. This individual is extremely dangerous and must be avoided at all costs. If you sight a grandma billy hold completely still and keep blank thoughts as most Grandma Billies can hear thoughts.
Never before sighted by the public but Grandma Billy is rumored to have existed by Sigmund Freud and many other reputable psychological therapists.
by WTBHeals December 26, 2009
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