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If you say something happens over your dead body, you mean that you will stop at nothing to prevent it from happening.
John: i wana bang your sister, honey!

Wife: (pissed) over my dead body, remf!

John: (thinks) well, I couldn't have described your body better...
by Macho--man July 26, 2010
This phrase is a verbal objection to a proposed action, claiming that the author/speaker is willing to fight with every ounce of their life to prevent the action.
You want to take my kids away from me? Over my dead body!

*whips out a shotgun*
by Gumba Gumba April 14, 2004
you won't be able to do it if I am alive to prevent you
Your going to give in to peer pressure? Over my dead body.
by Light Joker December 15, 2005