When two people simultaneously masturbate while unknowingly thinking of each other.
"I totally spanked it while thinking about you last night."
"Oh my god, what time was that?"
"Weird, we were totally Stooking each other, cuz I was thinking of you while I rubbed one out!
to hover and/or stare
As the teacher was stooking around the classroom, the students acted confident in their intimidation skills