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.

a phrase chiefly used in northern England.

it is a contracted form of "it'll be reet", where "reet" means "alright" or "OK".

living your life according to "be reet" is the only way to find happiness in life.

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