Green’s Dictionary of Slang

phominator n.

[? SE fulminator, a vociferous (usu. critical) talker]

(N.Z. prison) an excessive user of the telephone.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 139/1: phominator, the n. an inmate who spends much of his time on the telephone.