friendly reminder 

a euphemism for "this is the last warning you're going to get before we open of a can of whoopass on you!"

warning of impending whoopass

Every Monday morning I get the same E-mail from payroll:

"This is a friendly reminder to submit a copy of your time card at your earliest convenience..." (read: 'If you don't send us your hours for last week asap, you're a$$ is not going to get paid on Friday!!')

friendly reminder by Juarcias October 13, 2009

Friendly reminder 

A preface used by malicious Tumblr users to disguise a painful statement about your OTP.

Friendly reminder that Cas didn't know Dean loved him back.

Friendly reminder by Xanthomonus June 11, 2021

Friendly Reminder 

A warning in Fandom posts to Not read the context unless you want to feel emotional pain. They may saline friendly but they aren’t

Friendly Reminder: George Weasley has to live the rest of his life without his twin.

Friendly Reminder by BOBDAFANGIRL November 24, 2018

Friendly Reminder 

A unique audible noise made by a man in attempt to warn his partner he is about to reach climax.

I was about to cum, so I gave Philippe a "Friendly Reminder."

Friendly Reminder by BigBoyShoes July 23, 2017