Seeing your mother naked

The state or act of being afraid.

If you're "scary" you're scared.

"Why you so scary for?" means Why you so scared for?
"Stop acting so scary." means Stop acting so scared.

When Phat Rat called G-Unit "scary ass niggas" he wasn't saying that G-Unit frightens him..
He was saying that THEY are scared of BWS and fear them.
(BWS meaning Black Wall Street)

Bringing a feeling of unease and terror

something that makes u shit urself.

A Hot Pocket fresh out of the microwave

extremely; very, very