S. D. Plissken's definitions

Merf

To make a mistake. The term results from the step-by-step transitioning as follows:

1. Fucked up
2. Muffed up
3. Merfed up

Also, a slurring of "motherfucker" which can be used in polite public.

After erasing a large data file from his computer, Tony's friend said, "Dude, you merfed up big time!"

by S. D. Plissken March 25, 2005