underdig

verb2

1. •
   To dig under or beneath (something); to undermine.

   • Issa found a place where the fence had been underdug, and thought about sneaking into the town. But she couldn't think of anything she wanted to do in there. — 2011
2. •
   (slang) To fully understand or comprehend.

   • Fuck givin' body shots I'm hittin' you in yo wig / Ya underdig? — 2000