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
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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?
by Tardy McTard July 28, 2004
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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.
by CARLOS666DICKLONG March 12, 2018
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