SOS n. Shit on a Shingle.
In the military this refers to creamed chipped beef on toast.
In the Southern US, a similar dish is made consisting of chunks of
fried ground beef in a thin cream
gravy, served over toast. It is associated with poverty, because it is
cheap, packed with calories, and filling.
"Hey
mama, is that SOS ready yet?"
"
Naw, we're out of
PET milk, somebody's gonna hafta go ta the store."