A person who always interrupts your story with a better story of his/her own.

The number of cats can increase depending on how 'full of themself' the person is. ie (Karen is an 84 cats/Karen has 84 cats)

Someone who always trumps your story and is always better.

Not to be confused with someone who actually owns cats.
Michelle - I went on a beach holiday........
Katrina - My sister's friend's aunty's cousin went to the beach the other day.
Michelle (thinking) - OMG, Katrina is such a three cats.

2. Karen doesn't have 3 cats, she has 84 cats!
by Claudia_____ May 15, 2010
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A Macintosh user who is still using Mac OS X "Panther", in spite of their being two newer versions (Tiger, Leopard)
Pal: Hey, you load up Leopard on your machine yet?

Me: Nope...I'm Mr. Three Cats Back!
by BWB October 31, 2007
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Yet another Southern way to describe something as being extremely fucking hot.
Peggy Mae, turn down the fucking heat, it's hotter than a three balled tom cat in here!!!
by Wes Nile November 16, 2007
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A Macintosh user who is still using Mac OS X "Panther", in spite of there now being two newer versions (Tiger, Leopard)
Pal: Hey, you load up Leopard on your machine yet?

Me: Nope...you can call me Mr. Three Cats Back!
by BWB November 29, 2007
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