Lulzfest 

An equivalent to a shitstorm, but a lulzier one.

I just received a lulzfest after I made my 9/11 stamp.

Lulzfest by LiteratePothead October 12, 2011

Lolzfest 

A festival of laughing out loud.

It was the biggest lolzfest ever when Daniella ran into a glass window.

Lolzfest by Santos December 28, 2013