Lmbo is a more appropriate version of Lmao for people who want to kiss their mother with a clean mouth. It stands for "Laughing my butt off", "Laughing my bones off", "Last mountain bird observatory", "Little mister Bobby Opal", or "Lying my behind off".
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.