Top definition
deep deep hip hop sounds and music. Straight hardcore conscious rap music.
Artist like Kenn Star, Supastition, Freddie Foxxx, krumbsnatcha, Teflon,Akrobatik, Kurious, q-unique.. make undergrounder music cuz.

The "undergrounder", the better {Propz to Clara (Flawless}
by SalamSM October 22, 2007
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2
a zit that is deep, with no white head, painful, and bulbous, it takes a long time to head up and is generally super annoying.
dude, i got a huge undergrounder on my forehead!
by prot1a5 September 21, 2005
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