Breasts that stand up in defiance of gravity despite their size, particularly when laying down. Antonym of armpitties.
"She may not have a great booty, but her anti-gravititties are so incredible I can't look away."
by JoNance April 15, 2014
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When the buzzoms of a person are extremely saggy due to gravity.

Most elderly woman, and obese men have gravititties.
"Her double D's are nice but they hang to low, she has gravititties"
by shrewmonkey July 13, 2014
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Breast that droop way more than expected when released from a bra.
Yo, shorty took of that bra, straight Gravititties Fam!
by Old Baby Face July 28, 2014
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