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1.
Something that is true or legitimate.

Originates from American boxer Evander "Real Deal" Holyfield; popularized as a phrase by Snoop Dogg in "Ain't Nothin' But A G Thang"
"And that's realer than Real Deal Holyfield" - Snoop Dogg

You can get either the generic brand or go for the real deal holyfield if you want the quality kind.
by Freak Speely November 24, 2009
 
2.
something that is legit, or true
Damn, that concert was real deal holyfield.

or

That lady was the real deal holyfield.
by ~`kellen`~ August 30, 2009