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1. An exclamation of surprise, chiefly British, meaning the equivalent of "watch out" or "watch it".

2. When used nonchalantly, can also mean something similar to "take care", or "good luck".
James: (upon nearly stepping in a pothole) Wotcher!

Greg: I've got three exams tomorrow.
James: Ooh.. wotcher.
by Dr Fruitcake October 12, 2005
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!")
by placebo February 13, 2005