though since i've been a wrestling fan, i use "to mark" slightly different. when someone gets really excited over something, they "mark out".
like there was a news story about this sold out Hannah Montana concert, and behind the news caster lady were a bunch of screaming ten year old girls marking out for Hannah Montana. and also this by-story on how this man gave a little girl his ticket because the girl had the cancer and was dying or someting. though all i wondered was why this creepy old dude had a ticket to an event crowded with pre-teen girls.
*calls Chris Hansen*