Green’s Dictionary of Slang

scat n.3

[ety. unknown]

(US black) the vagina.

[US]E. Folb Runnin’ Down Some Lines 153: Terms like to boogie [...] for intercourse and scat for vagina all suggest sex in musical or dance terms. [Ibid.] 161: Don’ wanna be tied up wid no punks. Go out and get some scat, catty-cat.