Slang term, noun: Short for "Charisma", used when describing someone who has it or is trying to use it on someone they want to be their partner.
Another word for someone who has charisma is "Rizzler", a gen-Alpha term for someone good at wooing women.
"Chad rizzed up those ladies at the party"
"Look at that guy, he's the Rizzler"
"Bro has no rizz"