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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.
Yerf by Nick Stark September 13, 2008
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Yerf-Dog 

Go-karts that are ridiculously overpriced, for example a 4HP Yerf Dog go kart that reaches a max speed of 10mph costs $850.00. It is rumored that a drunken man by the name of Hardcore Jerry once wrecked his Yerf-Dog into a tree at 3AM and nearly killed himself.
Hey, did you steal my Yerf-Dog?
Yerf-Dog by Tardy McTard July 27, 2004
Related Words

yerf dog 

a go kart that is complete garbage cause you and your friend went half on it for $360 dollars, and you have no clue why it doesn't RUN...
fuck that dumb ass ugly piece of shit YERF DOG cart my dog.
yerf dog by CARLOS666DICKLONG March 12, 2018
Harpo yerfniw is oprah winfrey backwards paul.
thats good to know johnny. now lets dock
yerfniw by Crang Tung April 27, 2011
Sexiest asian man alive. Massive 12 incher contrary to popular belief. Can be overwhelmed by his sexual instinct at times.
Alexis: Have you seen this guy?? He probably has a tiny schlong
Zakary: Are you crazy man? Never judge a book by its cover, he's a Jeffrey (Yerffej)!!!
Yerffej by Ckiettdanslacaille February 21, 2021