ETYMOLOGY
from sarcasm + -ous
EXAMPLE
“…Like th’ Hebrew-calf, and down before it
The Saints fell prostrate, to adore it.
So say the Wicked—and will you
Make that Sarcasmous Scandal true.
By running after Dogs and Bears,
Beasts more unclean than Calves or Steers?…”
From: Hudibras: in three parts, the first part
By Samuel Butler, 1663
Lexicophilia 