Shockingly, derived from the separate english words "turbo" and "pants." Together this combination yields a description of an adorablegirlfriend who can both be exquisite and elegant, yet at the same time fall out of her chair and have trouble walking from place to place.
Look at that beautiful girlwalking down the... OH NO, are you ok there turbopants?
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.