Top Definition
Refering to farts that resemble a grandpas odor, or a nursing home, this is most common in women or after a man eats fast food. If the fart does not smell like slough it's prolly gonna be some gramps...
"holy shit dude, that's some grandpa ass!"
"dude, it's gramps!"
"that Burger King gave me some serious granpa ass!"
by Sknudson April 07, 2008

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