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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

messed up from the chest up 

when a male or female has a bangin' body but a jacked up face
girl 1: "guuurrrl, he so hot. he got a body like a soccer player!"
girl 2: "yeah, but he messed up from the chest up!"

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
you speak in chat
chat -up in the meeting

chat-up a noun
chat-up by ralasila May 25, 2021
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

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