Definition of whatso in English:

whatso

determiner & pronoun

archaic
  • Whatever.

    as pronoun ‘whatso goes into their brain comes out as prose’
    • ‘They answered, ‘O our lord, we know not at all, but he bade us deface whatso we had done.’’
    • ‘Then said the king, ‘Choose for thyself a horse, and whatso thing else thou desirest among my matters.’’

Origin

Middle English: reduced form of Old English swā hwæt swā ‘so what so’.

Pronunciation

whatso

/ˈwɒtsəʊ/