The listener-proclaimed "underground" music that EVERYONE knows about and listens to which in turn makes it roughly mainstream. Understream is the gray area between Mainstream and true underground.
Understream:
Curren$y, Mac Miller, KiD INk, Big Sean, J. Cole, Nipsey Hussle, French Montana, etc.
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the small ditch under the tip of your penis; funnels sperm when masterbaiting.
Man was that understream flowing with cum!
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