Green’s Dictionary of Slang

1. (US black) a condom.

1935		J. Conroy World to Win 194: How about some safeties, buddie, pal? Three for a quarter, and genuine Merry Widows.
1948		(con. 1927) in Randolph & Legman Ozark Folksongs and Folklore (1992) II 618: S is for safety that is made of fish skin.
1953		S. Bellow Augie March (1996) 494: I was trying to have one night with the girl [...] For weeks I was carrying a safety in my pocket.
1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular.

2. (US black) a bed.

1944

‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.

3. (US drugs) a safety pin used as a hypodermic needle.

1952		in Lannoy & Masterson ‘Teen-age Hophead Jargon’ AS XXVII:1.
1953		Anslinger & Tompkins Traffic In Narcotics 314: safety. A safety pin used as a makeshift hypodermic needle.