Underdig

[Sarah]

To dig under or beneath; to undermine. [Obs.] Wyclif.

[Sarah]

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

[Sarah]

(n.) understand; a combination of the terms do