The word Yarhs is derived from "yes". It is the shorter and cooler way of saying "yes". The word Yarhs is said loud and long i.e "Yarrrrhhhhs". You use the word at the end of a sentence from a pay out or from a joke.
1)Kale is a noob. Yarhs!
2)How do you catch a bra? with a boobie trap. Yarhs!
3)Whats that? you have a small penis!?. Yarhs!