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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)
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