A cuss word that is yelled at the top of your lungs when you are frustrated and/or pissed off. It is also a word used by douchebags that cheat on their girlfriends four times and lie to her face about it.
"I cheated on my girlfriend more than four times and now she dumped me...FUCKINGTITTYCOCK!"
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.