Getting really excited for something beyond logic or reason.

This is from an extension of the wrestling fan phrase and has grown into the modern lexicon. It usually comes from something you enjoyed in your childhood that you still enjoy into adulthood without logical reason.
"Dude, I totally am marking out for the RUSH concert"
"Man, when I saw Ozzy Osbourne... I started marking out"
"Theo Fleury is trying to make a come-back? I'm totally marking out dude!"
by Balls MFing Mahoney August 07, 2009
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To temporarily forget that wrestling is fake because something cool happened.
I totally marked out when Hogan came back from that beat down!
by Anonymous September 18, 2003
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When you "mark out" you stand up for something or believe something completely. If you're a massive fan of a band and you refuse to let people critize them, you are marking out.

Believing something completely.

Comes from the wrestling term markwhere a smark forgets reading the spoilers, guessing the storylines and bitching about backstage and just feels the moment.
1. Dude, you always mark out for crappy emo bands.

2. Yeah, I totally marked out last night when Foley got thrown off the cage.
by BDV1 April 12, 2004
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1. Getting Exceptionally excited during wrestling for a certain wrestler or move

2. A term for Masturbating to a wrestler
1. I totally marked out when CM Punk won the title

2. I was up late last night marking out to pictures of Mickie James
by Shaner Ramone July 29, 2008
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Quietly leaving a group activity on the early side without saying goodbye. Like an Irish Exit.
Hey man, did you Mark-out on us last night? You just disappeared - did you have to run to catch your canoe or something?
by madriver November 28, 2018
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When you get really excited to do something, then last minute you back out.
Jon said he would come to the concert, he was talking about it all week. Last minute he "marked out".
by Devastastor October 14, 2011
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