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To speak to someone with the intent of eventually engaging in sexual intercourse with them. Generally conducted in a relaxed, playful and outstandingly obvious manner.

Almost invariably carried out by men on women; to be a male recipient means you're either extremely lucky or the giver believes you, as the British say, to bat for the other side.

A common, braindead, and therefore quintessentially British phrase, which explains the strange and nonsensical definition(s) sitting next to this one. To chat up is a type of the unfortunate word of banter, which shares all three properties mentioned above.
Guy 1: "Cor, look at all the fit birds in the place!"
Guy 2: "Yeah, I'm gonna chat up the one in the tight black skirt. Phwoar!"

Guy 1 walks in hungover and bruised.
Guy 2: "What did you get up to?"
Guy 1: "I got trashed and started chatting up this stunner. I started pulling and I was all set to bang her but then her boyfriend came back from the bar."

A couple are at a restaurant. The girl goes to the restroom while the guy places the order. When she comes back, the guy and the waitress have just finished talking.
Girl: "I can't take my eyes off you for a second. You were blatantly chatting her up."
chat up by Isacki February 18, 2009
The word used to tell someone to chat online

To use the chat feature in a virtual meeting

The complete opposite of shut up, except using an online chat tool.
Please chat up?

Are you going to chat up?
Chat Up by anonymous May 25, 2021

Cheeky chat up line 

a chat up line designed to shock and amuse
a cheeky chat up line is: call me butter coz I'm on a roll OR call me flora coz i spread easily

chat you up 

Talking sexy to someone knowing full well where it will eventually lead.
I'll chat you up late tonight, baby.
I am so gonna chat him up tonight.
chat you up by Rulee December 17, 2008

chat it up

"we hadn't seen each other in ages, so we spent hours just chatting it up"
chat it up by Anonymous October 30, 2001

chat the fuck up

a notice for someone to keep talkin...the new version of 'no way' and 'you dont say'
ed: you know whats crazier...he took the money and had them pay him for it...

dave:chat the fuck up bruv!
chat the fuck up by ed the Word October 5, 2009