Green’s Dictionary of Slang

(Aus./US campus) perfect! also as adj.

1979		Lette & Carey Puberty Blues 10: I handed her a pen. ‘Perf!’ she said.
1992		Eble Campus Sl. Apr. 7: perf – perfect, exactly suited; so tacky it’s stylish: ‘That Washington Monument thermometer is perf – I must have it’.
1997–2002		Hope College ‘Dict. of New Terms’ 🌐 perf adj. Derived from the word perfect. Used to describe something that works out well or to one’s benefit.