Canadianism, short for "you've got her." In this case, the "her" often refers to a specific goal, particularly following a menial task.
by Tom Megginson October 17, 2005
Once the girl drinks one shot, she instantly becomes a slut and or whore. Than anyone there has a legitimate shot and walking home with some poon.
"Our friend Emily who lives downstairs is a one shotter you got 'er. Yeah I even heard she got with Pat!"
by Bob Dylan 420 January 6, 2010