Green’s Dictionary of Slang

kaka

see under caca and its combs.

In compounds

kaka fulla (n.)

(N.Z. prison) a general insult: an untrustworthy or untruthful individual.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 97/1: kaka fulla n. a false, untrustworthy, deceptive or untruthful person.