Cat Flap 

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.

Cat Flap by tropical October 17, 2007

Cat Flap 

Ever seen toy story? You remember Sid? Now think of him but more bisexual. Aaaannnnndddd that's a cat flap

"That Leon is a bit of a cat flap isn't he"

Cat Flap by AmazeeHD March 7, 2017

Cat Flap 

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"

Cat Flap by EugeneUK September 28, 2008

Cat Flap 

A cats flap

Guy: "Ive lost my keys!"
Guy: "Its going to be very hard getting in this cat flap"

(Later on)

Guy: "This is moist but atleast I have my keys!.."

Cat Flap by The mysterious stranger March 23, 2010

Cat Flap 

A flap in a door that a cat usually walks through... but it is also another phrase for vagina

I cannot fit into the cat flap!

Cat Flap by melon spoon November 17, 2015

Cat Flap 

Labia (Pussy Lips)

I bought alkaline soap for my cat flaps.

Cat Flap by Rhino That is Albino August 3, 2017

Cat flap 

Lesbian term for a woman’s vagina

I preferred her cat flap to a mans penis.

Cat flap by CandyCane83 January 26, 2018