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1.
cool, sweat, or all around good
"Yo man, those tiki torches worked out awesome"
"Yea dude... murfin"

"Dude that chick at the party was really hot, and she got naked"
"murfin"
by eltimo December 04, 2007
 
2.
In a sexual context, the act of placing one's mouth on another's belly (or other area of the body) and blowing, thereby creating both a sonorous and pleasing sound and vellicating the recipient, causing them to squirm. Variations on the murfin include a "wet murfin" (incorporating the excretion of saliva onto the recipient during the act of murfing) and the "hairy murfin" (whereby the murfiner grows a mustache and engages in the act of murfing).
Guy: I gave your mom a murfin last night.
Friend: Dude that's gross!
Guy: Don't worry, it wasn't hairy, just wet. Wet all over her belly.
by Desimoto March 31, 2010