The act of ejaculating onto a portable mirror, letting the ejaculate dry into a crust, then using a razor blade to scrape up the crust into a powder, making lines and snorting it.
My nose burned a little after my first criffing attempt, but I'm glad all that semen didn't get wasted on your mom's ass like it usually does.
1) To remove the fun from a situation (especially a competitive game.)
2) Someone who disappears for the night with a member of the opposite sex and then refuses to share the sordid details of the encounter with their friends
1) oh god, he completely cliffied that game of monopoly
2) Come on, what happened last night? Don't be a cliffy