When you absolutely plough the shit out of the side of someone's thigh with your knee, hence named because they will be walking like a grandad for the rest of the day.
by Frankoyo December 2, 2013
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Get the Grandad mug.by Jimby Bobbinson May 3, 2018
Get the Grandad mug.Your grandad that’s why
by Crjames September 27, 2019
Get the Grandad mug.Hi grandad
by Rugbyface10 December 17, 2018
Get the Grandad mug.by Chicken83 April 8, 2007
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