To flirt with someone

Noun that can refer to both the act of flirting with the intent of something more, and the mission to flirt with intent and succeed. It differs from mere flirting, which is common between friends and colleagues, because one only chirpses someone who they fancy or are attracted to.
Verb: chirpsin or chirpsing

Slang for "chatting up".

to be chatted up

To flirt with intention

Talking (usually to the opposite sex who you find attractive)

To chat up, flirt with, a memeber of the opposite sex (unless your gay lol)