Unget

To be ungotten is the result of the paradox in which you kill your grandmother before your mother is born (assuming such a paradox wouldn't just result in another branch of the multiverse where you never existed)...

Un*get" (?), v. t. [1st pref. un- + get.]

To cause to be unbegotten or unborn, or as if unbegotten or unborn.

I 'll disown you, I 'll disinherit you, I 'll unget you. Sheridan.

© Webster 1913.