1
general::
In no way, under no circumstances, as in Over my dead body will you drop out of high school. This hyperbolic expression is often used jokingly. [Early 1800s]
American Heritage Idioms
2
general::
Phrase(s): Over my dead body!
Inf. Fig. a defiant phrase indicating the strength of one’s opposition to something. (A joking response is "That can be arranged.") • Sally: Alice says she’ll join the circus no matter what anybody says. Father: Over my dead body! Sally: Now, now. You know how she is. • Bill: I think I’ll rent out our spare bedroom. Sue: Over my dead body! Bill (smiling): That can be arranged.
McGrawhill's American Idioms And Phrasal Verbs