Falling asleep while fucking. Sleepfucking somebody can be a hazardous practice since you can get gonorrhea or syphilis by the time you regain consciousness.
High frequency sexual intercours breaking the sound barrier by reaching at least 180 BPM (beats per minute).
"Last night Steffi and I were speedfucking in such a high frequency that we woke up the neighbors with a big boooooooooom when we reached the sound barrier"
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.