Green’s Dictionary of Slang

chirpsing n.

(UK teen) flirtation, thus chirps, to flirt.

Urban Dict. 10 Mar. 🌐 chirpsing Slang for ‘chatting up’. Yeah, I found him chirpsing my gal, cha!
[UK]Jade LB Keisha the Sket (2021) 91: A boi 4rm round ma endz churpsed me.
[UK]Independent 5 Jan. 🌐 Many other [teenage] words belong to MLE—multi-ethnic or multicultural London English— [...] Among the most pervasive are bruv, mate, bare, fam, gwop, or peas (money), and chirpsin’, linkin’, and lipsin’—flirting, dating, and kissing respectively.
hubpages.com ‘Roadman Slang 4 Jun. 🌐 To be ‘on the chirpse’ - to be talking to someone online in a flirtatious manner, for a long period of time.
[UK]G. Krauze What They Was 10: It’s not like man’s gonna chirpse some peng tings and get their digits on the way to doing a move.