Green’s Dictionary of Slang

1. (Aus. teen) a fool, an insignificant, socially inept individual.

1979

Lette & Carey Puberty Blues 98: ‘I jest said it [i.e. the smell of marijuana] was incense.’ ‘She believe ya?’ ‘Yeah, the Stan.’.

2. (orig. US) an obsessively zealous fan, orig. of rapper Eminem; thus v. to follow obsessively.

2017		Z. Williams in Guardian 9 June 🌐 I read in November – as part of the dazed explanation for Donald Trump’s victory – that ‘stans’ were more important than supporters. I had to Google what a stan was: it is a wild enthusiast, an off-the-charts believer, a person who will bore the pub down.
2017		theroot.com 28 Aug. 🌐 Taylor’s detractors fried her accordingly. Half of her stans pretended to like the single [...] and descended on anyone who didn’t agree like an angry rash.
2018		Twitter 6 Jan. 🌐 [pic. caption] the only logan’s you SHOULD stan!!
2021		L. McInerney Rules of Revelation 306: Fans. Stans. Anti-fans. Groupies.