After friends have a nasty fall out or a BF/GF break up and they race to comment or like a mutual friend's pictures/posts on facebook before each other in an effort to 'claim' the mutual friend and have them on their side of the break up/fall out.
Fuck, my bitch ex was Marking Facebook Territory on Sarah's profile picture before I could like the picture, now I can't comment or like Sarah's picture!
A term used to indicate that you will be "right here waiting" for someone. It references Richard Marx's hit ballad "Right Here Waiting", released in 1989.
Sally: I just have to run into the mall to buy a birthday present for my sister.
Blake: Take your time. I'll be Richard Marxing in the car.
Sally: Oh Blake, you're such a patient boyfriend. I'm so lucky to have you in my life.
to marc it/ marcing it is to be the ultimate cock block, stopping fellow wigman or friend getting the desired action from a female. doing anything in your power to stop said persons suceeding in grafting.