m-effer
A lazy person's way of saying 'mother fucker' without actually saying it. It’s like giving someone a slap with a pillow instead of a hand.
You said 'm-effer' in a group chat when your friend spilled coffee on you.
You texted 'm-effer' to your brother after he ate the last slice of pizza.
You yelled 'm-effer' at your dog when it chewed up your homework.