Green’s Dictionary of Slang

very friendly with.

1957		H. Simmons Corner Boy 49: He’s been tight with that babe ever since grade school.
1960		E. De Roo Big Rumble 108: You tight with Fangs Megs?
1977		J. Sayles Union Dues (1978) 18: We didn’t hear you kick one bit over them layoffs [...] You being so tight with the union rep and all.
1985		N. Pileggi Wiseguy (2001) 171: He was very tight with Joe Buddha, so wherever you saw Joe Buddha you saw Frenchy.
2000		G. Pelecanos Shame the Devil 232: He also wanted Erika, who was tight with Weston, all to himself.
2004		A. Mansbach ‘Crown Heist’ in Brooklyn Noir 125: All the small-timers who copped off him knew that Laz was tight with the old Jamaicans.
2021		J. Ellroy Widespread Panic 43: Joi was tight with Johnnie.