The motion of you rubbing the head of your penis in a foward direction only. (as pretend or not)

motions like: peting a snake on the head or turning on a flashlight

Turning it "on" is a descriptive task

Give a thumbs up
now rub the tip of your thumb to the heel in a forward direction and repeat

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.