What's the noun for muffing? Here's the word you're looking for.
muffin
(Britain) A type of flattish bun, usually cut in two horizontally, toasted and spread with butter, etc, before being eaten.
(US) A type of individual bread such as corn, bran, banana or zucchini bread often sliced and spread with butter, etc before being eaten.
(especially US) (informally) A cupcake without frosting, but sometimes glazed.
(computing) A mechanism used in the Java Network Launching Protocol analogous to the cookie mechanism and which permits a program running in a browser to perform operations on a client machine.
(slang) Term of endearment.
(baseball, slang) A less talented player; one who muffs, or drops the ball.
(slang) A charming, attractive young man. (Can we add an example for this sense?)