Function (n.) - Abbreviation meaning "Negligible at Best" (the misuse of the word negligible to mean negligent in this context is deliberate). To be used when someone is being an unfavourable character, doing something unfavourable, or when someTHING is unfavourable.
"My final exams are coming up and I have a shit load to study, it's nab."
Abbreviation for "New Africa Bammer". Mid-grade marijuana.
Me: Hey man you got an 1/8 of chronic?
Natg representative: Ya man I gots da dank shit.
Me: Wtf man.. This is the nabs.. Don't put this shwag in my face again or I'll stab you in the face with a soldering iron.