Green’s Dictionary of Slang

steef v.

(US campus/teen) to steal, to borrow.

Urban Dict. 31 Mar. 🌐 Man dat dude be steefin.
[US]C. Eble (ed.) UNC-CH Campus Sl. Spring 2016 9: STEEF — steal or borrow: ‘Your shirt is so cool I want to steef it’; ‘Can I steef your notes from class yesterday?’.