understream

the small ditch under the tip of your penis; funnels sperm when masterbaiting.

Man was that understream flowing with cum!

by [Ak]47> March 26, 2009

Understream

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.

by B.Mathers January 12, 2011