Green’s Dictionary of Slang

in rap music, the Technics SL 1200 turntable, regarded as the best turntable for DJ’ing.

1990		Kings of Swing ‘Swing Fever’ 🎵 on Strategy [album] That’s my DJ, she’s rockin, you’re not / She’s on the 1200 and the girl can jock.
1999		Esau ‘Underground?’ 🎵 on Debut Album ... The Farewell Tour [album] You ain’t underground cause you buy vinyl to rock on your 1200 set.