Green’s Dictionary of Slang

telephone n.

1. [1950s+] (Can.) a bilingual or multilingual Canadian who moves between the two national groups – Anglophone and Francophone – and is generally despised by both.

2. [1970s+] (US campus) a euph. for toilet, e.g. I have to use the men’s telephone.

3. [1980s+] (Aus. prison) a means of inter-cell communication in prison by tapping on the plumbing pipes.

4. [1990s+] (UK Und.) a scar in the form of a curving line from the corner of the mouth to the earlobe, inflicted on an informer’s face.

In phrases

big white telephone (n.)

[1970s+] the lavatory.

speak into the big white telephone (v.) (also shout down the..., talk to God on the…)

[1960s+] (orig. US) to vomit.

talk to Ralph (on the big white telephone) (v.) [ralph v.]

[1970s+] (orig. US campus) to vomit.

talk to the (big) white telephone (v.)

[1970s+] (orig. US campus) to vomit.