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1.
a double buckler is the common word for someone who is a slut. a double buckler is someone who usually fools around with more than one person at a time, or goes far sexually with someone on the first date/time meeting.
Jessi double buckled with Wayne the first night she met him behind the fence.

Jamie has been double buckling with Barry even though she was supposed to be exclusive with Randy!

"Ewww did you see Rachel double bucking with that kid at the party? she has a boyfriend!"
by jayjay141414 June 15, 2008