Green’s Dictionary of Slang

zitz n.

[? zit n.1 ]

1. the vagina, esp. when glimpsed beneath clothes.

[US]H. Rawson Dict. of Invective (1991) 39: Beaver probably originated as a street cry — a code word that men could call out to other men, advising them that if they looked sharp, a woman without underpants might be seen; cooze and zitz have been used the same way.

2. see zit n.2 (1)