As an interjection wotcher is
(chiefly|british) a friendly greeting or wotcher can be (chiefly|british) what do you.
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Not English
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wotcher
English
Etymology 1
Corruption of what cheer .
Interjection
(
en interjection)
(chiefly, British) A friendly greeting.
- [Dick Francis, 1962]
Etymology 2
Abbreviation of what do you .
Synonyms
* whatcha, watcha, wotcha