A bullshit marketing term car companies made up to sell their shitty oversized pickup trucks. Truck "month" is actually done year-round instead of a specific month, but car companies hope the dumb hicks who buy their trucks won't notice.
Dumb hick: Yee-haw, I'm gon buy me a Ford F150 cause the picture box says it's truck month!
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.