Green’s Dictionary of Slang

item n.

1. [19C–1900s] (US) a hint, an inkling, a piece of information, thus one who hints.

2. [1940s+] (US) a person.

3. [1940s+] (orig. US) a couple.

In compounds

hot item (n.) [the exploits of such fashionable individuals provide items for newspaper gossip columnists]

[1980s+] (US) a couple having a romantic relationship.