"
A capella" definition is wrong. Not usually used by rappers, but rather by people that actually...sing (and sing well) without instrumental
accompaniment. Please see
http://www.singers.com/a-cappella.html
...for more enlightenment on what
a cappella is.
"Hey guys, let's sing real
a cappella, with no instrumental
accompaniment. And better yet, let's actually sing and use musical notes in our music and not chant simple rhymes and curse words in a monotone like the music artist b rabbit does in
8 Mile!"
"Sounds great! Wait, b rabbit is a music artist? Since when?"