Slang for vocabulary or gift of speech. Having a strong vernacular.
It's origins might come from an old Fugees song called "Vocab".
"You got the vocab"
"Did you hear that lyric by Jay-Z in that track, Lucifer? Man, he's got the vocab fo sho"
A stupid subject where you need to learn the definition of words but doesn't even help you in life.
Vocab is the worst and stupidest subject but my mom is very good at it.