The sexual position in which one partner is held in the air upside down performing fellatio or cunnilingus and reaching around to finger the anus of the holding partner
Mary and I did the "Zero G Reverse Reacharound" like no tomorrow.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).