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Not used at all in day-to-day English in London.
Harry Potter and the Order of the Phoenix is perhaps the only example of "wotcher" being used.
by Incandescent August 05, 2007
A British slang term formed by the contraction of "What are you up to?"
"Wot'cher up ta?" devolved into this now-common greeting. See also wotcha.
"Wotcher, Harry! Good to see ya, mate!"
by flamingsword May 23, 2005
Slang for "What's up" and "What are you up to"
Though many only reference this terms use in Harry Potter, The 2006 Sean Ellis film, Cashback, also has the younger protagonist and his girlfriend greet each other with this colloquial term.

Ben: Wotcher
Tanya: Wotcher

The term is pronounced "watch-uh"
by mz35 August 15, 2008
An updated, shortened version of an older English greeting. The 17th century "What cheer?" became "Wotcher?" with assorted spelling (bein' 'as 'ow it's spoken English)
Wotcher mate, fancy a pint?
by One_who_knows March 10, 2009
a greeeting in Britain.
hey UD-ers, wotcher?
by hytham_hammer July 05, 2005
A shortened form of "what cheer!"

A greeting between friends, used mainly in London. Also spelled "wotcha."
"Wotcher, Harry!"

-Harry Potter and the Order of the Phoenix
by Lisa Radcliffe April 11, 2005
A slang term used in means of greeting.
Wotcher cock!
by Jill September 13, 2003