get up on

(v) : (slang, African-American Vernacular) To interfere or involve oneself with (something); to become deeply involved with (something); to intrude into or be nosy about (something).

(v) : (slang, African-American Vernacular) To best someone in a competition; to successfully challenge someone.

(v) : (of a male subject, slang) To have sexual intercourse with deep penetration.