The sound a male human with a normal libido makes when he sees a cute girl that he wants to have sexual relations with. Actually a play on the word "pussy" as another name for "pussycat", an animal that make the sound associated with the word "meow".
Everytime I see a cute girl I say "Meow" because she make me feel like a little pussy.
I word that I, like many people use when I think you're a complete idiot and I can't be assed with having an intellectual conversation with you. You think i'm doing it to be cute. -_-
You: Hmm, I have softball practice today.
me:...
You: so....
me: Meow!
You: awe that's so cute you're funny lolololol.
me: Haha yep. *rolls eyes*