The expression of online anger or frustration through the random typing of keys that always end up being in the homerow. Nobody ever actually types "homerow fury", but rather any letters that their angry fingers can find.
An act of showing extreem emotion. One just can not find any words to express oneself and thus just randomly hits keys wich almost always are on the homerow. It is mostly used to express anger or rage. But it can also be used to express other emotions like: amazement, sadness or joy. It is often typed with caps lock on, and followed by multiple exclamation marks.