Driving with extreme speed, dangerously or in a real rush. Occasionally used when not driving, ie, a small child running around a house and likely to collide with someone or something. Named for Juan Manuel Fangio, Argentine race driver.
I thought Sam and I were going to be late, but we drove there really quickly, he was really fangin it.
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.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.