1
general::
Extremely advanced, referring to some progressive action or condition. For example, These trees are too far gone to be saved, or He's had a lot to drink and is too far gone to drive himself home. [Mid1500s]
American Heritage Idioms
2
general::
Phrase(s): far gone
1. in an extreme state, usually an irrational or intoxicated state. • Wow, that chick is far gone. Listen to her rave. • He was too far gone to make any sense. 2. intoxicated. • Larry’s far gone and looking sick. • Wow, is she ever far gone!
McGrawhill's American Idioms And Phrasal Verbs