A phrase usually used after something funny is said to make the joke even better. If you haven't used this word before, you've been blind your entire life.
"Stop! Hammertime!!" everybody yells at the same time. Then Nathan says "Cachigga!!", and everyone is on the floor, laughing their asses 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.