Key Smashing is an action done when someone is experiencing extreme emotion-- generally happiness or frustration-- by slamming hands down on the keyboard and hitting random letters/ keys. It can be in all Caps, lowercase or a mixture of both.
also relates to a asdfasdfasdf
a typical, happy, key smash: " I just got a new puppy! ASDXHFCGJMHJDRERZFD! SOO CUTE!!!!"