Country Dictionary

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!"

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

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.

A slang term used in means of greeting.

Wotcher cock!

An English colloquial greeting that perplexed thousands of Americans upon reading Harry Potter and the Order of the Phoenix. Tonks uses it as a greeting, obviously requesting a sexual favor that will take place in the 6th book.

"Wotcher, Harry!"

("I want to feel you inside me, Harry!")

The cool way of saying "What are you up to?" in a formal greeting, because the British have the best slang. Alternate form is "wotcha".

"Wotcher?" Alice Morgan said, as she rescued Luther from Stark.

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"