flavour of the month
US /ˈfleɪvər əv ðə mʌnθ/
UK /ˈfleɪvər əv ðə mʌnθ/
1.
a person or thing that is popular or fashionable for only a short time
:
•
Reality TV stars are often the flavour of the month, quickly replaced by new faces.
•
His new album is the flavour of the month, but I wonder how long it will last.