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.