Spotted in Day’s Road, The Dings, Bristol.

billboard with slogan hello fairer banking subvertised with added hello oxymoron text

Subvertising (noun), a portmanteau of subvert and advertising.

Definition: The practice of making parodies of corporate and political advertisements in order to make an ironic statement.

Oxymoron (noun), (plural) -mora.

Definition: (rhetoric) an epigrammatic effect, by which contradictory terms are used in conjunction.