1 definition by flyingp3nguin

Top Definition
A play on the word "mainstream". Refers to various specific forms of media, primarily music, that cater to the mindless mass of people who lack the ability to judge different inputs as either good or bad.
I dislike Flo Rida. He's too sheepstream.

KIIS FM plays too much sheepstream music.
by flyingp3nguin May 10, 2009
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