Green’s Dictionary of Slang

1. (Aus.) a sanitary man, who removes sewage.

1996		A. Close Official and Doubtful 250: No Queensbury rules in the bedroom but if I lay hands on you without a hard-on you’d think the sanny man had slapped an order on me.
1999		(ref. to late 19C+) G. Seal Lingo 78: One term whose diminutive has definitely been affectionate, if not downright essential, has been sanitary man, in use since at least the end of the 19th century. Widely lingoised as the sanny or sano man, this fast-disappearing trade is also known as the night man or simply the dunny man who comes to take the nightsoil away.

2. a sanitary towel.

1971		P. Scott Towers of Silence in DSUE (1984).
1998		A. Warner Sopranos 78: The sanny bin in the girls toilet.

3. (Scot.) a sandwich.

1994		I. Welsh ‘A Smart Cunt’ in Acid House 185: She just came in wi some sannys.
2012		(con. 1980s) I. Welsh Skagboys 8: Granny Renton has made loads and loads ay sannies on white, spongy Sunblest bread.