spread like wildfire
US /sprɛd laɪk ˈwaɪldˌfaɪər/
UK /sprɛd laɪk ˈwaɪldˌfaɪər/

1.
to spread very quickly to many places or people
:
•
News of their engagement spread like wildfire through the office.
•
The new trend spread like wildfire among teenagers.