A way of obtaining stuck materials from a vending machine by vigorously shaking your ass and rapidly bumping said vending machine. This should result in the vending machine in releasing it's goodness while entertaining witnesses.
Merking off is essentially the fusion of mewing, and jerking off, typically done by late stage gooners who are still looking for a way to turn getting caught edging into a sigmatical grindset moment. Though usually this still wont change the fact you just caught them edging to gay porn before the suns even risen yet, which there now using as a flex upon you.
Edward: do you know that guy in the dorm next-door? i caught him edging in the bathroom once and all he did was start merking off
Dennis: lmao but i would do the same thing if i were him