1
general::
Exhausted, very tired, as in After that hike I felt absolutely done in. [Colloquial; early 1900s] Also see DONE FOR, def. 1.
American Heritage Idioms
2
general::
Phrase(s): *done in
exhausted. (*Typically: be ~; get ~.) • I’m really done in! I think I’ll go to bed. • After all that lifting, Gerald was done in and breathing hard.
McGrawhill's American Idioms And Phrasal Verbs