Coined by the one and only MC Rich, Est. 2007. The definition of this wonderful phrase is pretty much whatever you want it to be. It can be a replacement word for a swear in a song, if perhaps you're singing a Dr. Dre tune whilst going for a drive with your Mother; it can be an exclaiming agreeing statement, much like saying "Hell Yeah", in a family friendly way; most of all it's just an exclamation, you say it when you're happy.
Joe: Check it out dude, I bought you a freakin' baby for your birthday!

Bob: Tyehoyeah!
by Danny McBrown July 11, 2008
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