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1 definition by Lester Hermit Mayfly

 
1.
the fat round protuberances found on a cat's stomach; swell after giving birth typically to feed kittens; Also known as 'nipples'.
Kitty cat, put your ninnies away!!(said in a high pitched british accent); Don't show your ninnies in the presence of others (insert cat name), it's rude!
by Lester Hermit Mayfly June 10, 2010