So New York (86) eighty-sixed Dwight Gooden in the 5th inning

from Slaughterhouse – Funkmaster Flex Freestyle Lyrics on Rap Genius

Meaning

Dwight Eugene Gooden, nicknamed “Doc Gooden” or “Dr. K”, is a former Major League Baseball pitcher. He was one of the most dominant and feared pitchers in the National League in the middle and late 1980s.
In 1986 Gooden was the Mets ace going into the playoffs. He was substantially worse in the World Series against the Boston Red Sox, not getting past the 5th inning in either of his two starts. Nevertheless, the Mets won four of the five non-Gooden starts and the championship.
The eighty-sixed in this case refers to the year and the fact that Gooden was pulled from the games in the 5th inning.

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