look up any word, like usuratonkachi:
 
1.
The ultimate triumphant roar. Demanding all attention in the room for the celebration of an incredible goal being completed.
Pronunciation: he+yeah put together (with soul) makes HEYEAH!!!
"HEYEAH!!! We win the game."
"HEYEAH!!! Drink one"
"He plus yeah put together makes HEYEAH!!!"
by Zachary Kamm December 17, 2007
 
2.
A contraction of 'hell' and 'yeah'.

person1: dude are you going to the underoath concert tonight?
person2: heyeah!
by davemadskillz May 09, 2007