Someone or something that’s suddenly the hottest thing going, but only for five minutes. It’s the shiny new obsession everyone bangs on about at work, online, or down the pub, until the next fad rocks up and this one gets binned. Usually said with a bit of side eye, like: calm down, it won’t last.
"He’s the flavour of the month at the office since he fixed the printer. Now he’s acting like IT royalty. Give it a week, Sharon will replace him with a new hero."