If you ever been to a cookout it is. But I guess it’s more of an ethnic custom so maybe I am projecting.
Dunno. I don’t know who the guy is and I don’t know what “SHIID” is supposed to mean.
“SHIIIIIIIID” is an altered version of “Sheeeeeeeeeit” which was a catch phrase said by Clay Davis from The Wire. He said this in times of duress or when he was casually or decisively dismissive of a situation or something someone said in conversation.