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3.
Pound sterling (money).
"'Do you have any couter, brother?' the old drunkie said to me and my droogs."

-- Anthony Burgess, "A Clockwork Orange"
by Twathenge April 10, 2006
 
1.
Synonym for VAGINA
Vagina, Pussy
by Paul Dana December 29, 2003
 
2.
Pussy; twat; another word for vagina that you can't get in trouble for saying
Girl: what's a couter?
Boy: that thing between your legs that I wanna taste
by mini muso March 04, 2011