1.) A spin off of aLtErNaTiNg CaSe, alternating UPPER case has become a meme designed by random internet users who try so hard to assert their panic/will on the masses - Almost as if they are speaking from a pulpit dictating and virtue signalling to the masses from their bedroom using their (most likely) thumbs.

2.) Can also just be used for teh lulz, instead of the aLtErNaTiNg CaSe, to come across extra sarcastic.

when you're hungover as shit after a spending a night drunk as a skunk