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 16, 2008
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To have one person, while in a car, sits on another person's lap and shares a seat and is buckled together.
There wasn't enough space in the car for everyone, so one or two people had to double-buckle
by Howaidonami June 2, 2010
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The act when a beautiful woman suddenly inserts 2 fingers into your chocolate freckle up to the 2nd knuckles instantaneously causing your toes to spasm and cramp up
While Sally was giving me a slurp and jerk last night she surprised me with a backdoor double buckle toe buckle!
by Captain staple July 17, 2019
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