Meaning of bass-ackward in English:

bass-ackward

Pronunciation /basˈakwəd/

adverb

slang, humorous, euphemistic North American
  • Backwards, back to front, the wrong way round; in a manner contrary to what is usual, expected, or logical.

adjective

slang, humorous, euphemistic North American
  • Contrary to what is usual, expected, or logical; back-to-front, muddled, perverse.

Origin

Early 20th century. Humorous alteration of ass-backward (although this is first attested later).