American adaptation of Roman (Italian) slang word "Rosicare"
1) When the unquenchable feelings of frustration, jealousy, injustice are gnawing at you.
2) Arises in scenarios when you are missing out on something or when something
annoying/bad happens to you that you had foreseen but could not control.
from the Italian verb : "Rosicare":
1) lit. to gnaw on something
ex. beaver gnaws on
wood, dog gnaws on bone
2) used figuratively in Roman slang as described above.