To be in a situation or event in which one race highly outnumbers all others. It is often used when those of another race are scared. It don't matter if you Black, White, or Polka Dot... if you're not one of them, you're surrounded.
(2 Black Guys at a Concert)
"Man I thought you said it was gonna be Busta Rhymes... This is LeAnn Rimes son!"
"Oh my bad man let's get the hell up outta here, we're *SURROUNDED* right now!!!"