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.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.