refudiate
To repudiate, to oppose.
Blends are the simplest kind of slip of the tongue […] some examples […] "refudiating" (refuting + repudiating).
Where it comes from
Blend of refute + repudiate. Often associated with Sarah Palin's infamous 2010 lapsus linguae. A few rare attestations predate the 1970s. Since then the word has been uncommon although not rare, but many written occurrences of the word focus on prescriptively repudiating its use; it remains nonstandard.
Adapted from the Wiktionary entry refudiate (CC BY-SA 4.0).