its a girl that has a butt that makes you giggle a little as you notice it. not always a fat butt or ghetto butt although they are more common usally seen when walking behind a girl and checking her out
haha look man she has a giggle butt
by skeet1991 February 3, 2012
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A Butt giggle is the fart that slips out when a person is laughing.
I let out a Butt Giggle as I was laughing at what you did.
by tejanito June 24, 2014
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