Green’s Dictionary of Slang

catso! excl.

also catzo!
[catso n. (2)]

a general excl. of annoyance, surprise, etc.

[UK]Jonson Case Is Altered V ii: Hey, catso! catch him alive.
[UK]Dekker Honest Whore Pt 2 (1630) II i: Ile bear vp for all this, and flye hye. Catzo Catzo.
F. Moryson Shakespeare’s Europe in Hughes (1967) 393: Catso is [the favoured oath] with the Italians, Futre with the French.
[UK]Beaumont & Fletcher Love’s Cure II i: Mary Catzo Signior Alguazier d’ye not know us?
[UK]Behn Rover pt II I i: Pet. Catso, a Fool, what else?
[UK]Motteux (trans.) Gargantua and Pantagruel (1927) II Bk V 530: Catso, let us rather drink, then.
[UK]Satan’s Harvest Home 55: They [i.e. Italians] have little else in their Heads or Mouths than Catso and Culo which they intermix with almost every Sentence.
[UK]Newcastle Courant 18-25 Nov. 4/3: Lord, Ladies, (Catzo!) see mine Phiz of Graas!