Something so repulsive and disgusting that it would cause someone to vomit; however instead of actually vomiting; one would just scream 'vomitrocious!' Invented by the children's show Arthur.
Binky: (Spits while at bat during baseball game)
Muffy: EW! VOMITROCIOUS!
A word used for absolutely fuccing disgusting. Usually used as an adjective for a noun that makes the speaker want to emit stomach backup, or vomit hence being vomatocious.
Did you see that large orange girl with the tight shirt showing her big ass rolls? She was vomatocious.