The fire I spit burn down Happyland
Social Club, we unapproachable thugs

from Jay Z (Ft. Amil, Beanie Sigel & Memphis Bleek) – You, Me, Him and Her Lyrics on Rap Genius

Meaning

The Happy Land Social Club fire was an arson fire which killed 87 people in the West Farms section of The Bronx, New York, on March 25, 1990. Most of the victims were ethnic Hondurans celebrating Carnival. Unemployed Cuban refugee Julio González, whose former girlfriend was employed at the club, was arrested shortly after and ultimately convicted of arson and murder. Wikipedia

Jay-Z is saying that his fiery lyrics is what caused it to burn down.

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