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A bisexual person. One who ''swings both ways''.
Did you hear about John taking a bloke home the other night?

Yes, I know he's always been a bit of a cat flap.
by tropical October 02, 2007
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The under belly of all cats. There are usually two distinct flaps between their back left and right legs. They are noticeable while strolling. They usually become larger as the cat gets older and/or fatter.
Caroline fed her young cat Seymour so frequently that his cat flaps eventually became so large that they dragged on the floor whilst walking.
by planetsleeep January 28, 2010
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that bird i pulled last night had the biggest cat flaps i have ever seen.
by badgerroy June 28, 2008
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The anus, especially in reference to anal sex.

Origin: picture the female perineum in the missionary position, and note the orientation of the vulva relative to the anus. Observce the similarities with the typical orientation of the front door and the cat flap in a house.

Other parallels regarding size and ease of human access further strengthen this metaphor.

"I've got the painters in this week, but you can go in through the cat flap if you like"
by EugeneUK August 04, 2008
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