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1.
To "Understand",is to Dig(like it or not) what a person is saying.
To "underdig" is a total comprehension of what someone is sayin'.

That's some California Bay Area Lingo...
brought to you by The E Forty (E40) himself... get the book learn the lesson..All others are posers. please believe

Make sure you Underdig what I'm saying, before I have to put my hands on you.
by Trust me January 02, 2006
 
2.
asking is some one understands
we got alot of things goin down tonight, be here early you under dig
by Bowlby September 28, 2004
 
3.
(n.) understand; a combination of the terms "do you understand?" and "can you dig it?"
-Used widespread throughout urban neighborhoods. Although the origins are unknown, Def Jam/ Roc-A-Fella/ Thugged Out Militainment recording artist N.O.R.E. aka Noreaga is credited for makeing the term mainstream.

I'ma be back later for my money; Underdig?
by Shizz August 09, 2004
 
4.
You underdig what i mean?
by P-duh January 09, 2003
 
5.
To understand.
From N.O.R.E
by Diego August 28, 2003