To cause delay by not typing something correctly.

The act of accidentally hitting a the wrong button, or spelling the wrong word, particularly on a smart phone.

Used to drop, or change the subject at hand.

When a conversation sucks and you just want to walk away or change to topic

Means your have a fat ass.

When you incorrectly enter a letter in place of another letter.

You have a run of screwing up what you’re typing and so you say loudly eff’n FAT Fingers Friday. BECAUSE you always rush stuff on the computer on Fridays and stuff it up because you’re in a hurry!