pip pip

Interjection

Meaning

(Britain, colloquial) Goodbye; cheerio, toodeloo (toodle-oo), toodle pip (mostly used by the upper classes).

(Britain, colloquial) A general greeting, mostly used by the upper classes.
Pip pip! What's going on here?

(Britain, colloquial) Used to create enthusiasm, mostly by the upper classes.
Pip pip! Let's get out there and knock the stuffing out of 'em!

pip-pip

(UK, informal, dated) goodbye

Source: en.wiktionary.org

pip-pip

pip pip emma pip out pip to the post pip-squeak pipa