Sounds like "watch". Taken from "Chachi". Used in Canada to refer to cheesy guys or their methods for picking up women. Old and tired lines like "If I told you I liked your body would you hold it against me" qualify as Chaching. "Chach-ers" are typically adorned in shiny, oversized jewellery and spend too much time in front of the mirror.
"Who's Sarah talking to?"
"Nobody. Just some loser trying to chach her."