look up any word, like blumpkin:
 
1.
A happy greeting sound or salutation, used almost exclusively by the furry culture.
"Yerf!" (read: "Hi!")
by LaserBeams June 11, 2003
 
2.
Any non-sexual furry content as opposed to yiff.
"That's a yerfy, G-rated site."

"I'm disappointed! Only yerf and no yiff!"
by SharpFang August 20, 2003
 
3.
Formerly the Squeaky Clean Furry Archives, this website hosted furry art of a completely clean nature. Overtime the site became very selective of who it let in, and so being accepted onto Yerf was considered a great honor for aspiring furry artists.
Yerf was The best furry art archive EVAR. Wish I could have gotten in.
by Fidelio January 26, 2005
 
4.
A word used to express exetreme excitedment, or eagerness.
Can also be used to express understanding of a subject, theory or plan.

The word is usually yelled obnoxiously in a manner such as lil jon would say yeah!

Derived from the name of the some-what popular go-kart brand Yerf-dog.

Also may be used anytime you make a powerful/sharp turn in a car.

Another use for the word is to yell it when looking for a friend in a crowd or in the woods, in this case yerf can be exchanged with the rapper "birdman's" signature call BRRRRRRRRRRR (as to imitate a pigeon or other bird-like creature's call)
Ex.1
Guy 1: Dude lets go smoke then get some slushies at Wawa
Guy 2: YEEERRRRRRRRRFFFFFFFFF!!!!

Ex. 2
Guy 1 pulls into guy 2's driveway quickly and smoothly and lets out a mighty "yerf" to signify his entrance.

by Nick Stark August 16, 2006
 
5.
v. to vomit while screaming
look out tommy's gonna yerf!
by babyteeth July 14, 2006