m-effer - A weak version of swearing used by people who don’t want to

A weak version of swearing used by people who don’t want to get in trouble. It's like saying 'ouch' when you should be screaming.

You said 'm-effer' during a class presentation.

You texted 'm-effer' to your sister after she took your snacks.

You whispered 'm-effer' to your friend when the teacher walked in.