A statement made to signify that what you speak is 100% the truth, the whole truth and nothing but the truth. Usually used when someone doesn't believe what you say, as it is bullshit, but this is used to try and make that person believe its true as its probably not.

What it actually means may derive from the old saying of "I swear on my mum's life!" which means absolutely nothing but some people think if that statement is said that they can't be lying.
"I swear down your honour, i didn't do it"

Nick: Did you know that Ahmed got arrested last night?
Keane: No he didn't.
Nick: Yeah man, swear down.
by GF November 30, 2006
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A phrase used to make a promise.
You can't lie on a swear bear
Jack: Dude, I just boned Megan Fox.
Austin: Really?!
Jack: Swear bear.
Austin: Holy Sht.
by GetWizzled January 8, 2012
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A promise made between two people, more common among young people or children, sealed by shaking hands -- except only with pinkie fingers. The idea is that if the deal is broken, the culprit will lose his or her pinkie finger.

The pinkie or pinky finger is the smallest, or farthest from the thumb. Also spelled pinky swear.
"I swear I won't tell anyone!"
"Do you pinkie swear?" (holds out pinkie finger)
"Pinkie swear." (hooks pinkies together and shakes)
by Coell CMU October 24, 2007
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A phrase that liars use as a last ditch attempt to instill belief in themselves to the person they're trying to con. It's always easy to spot a bullshitter when they pull out the infamous "I swear to god!"
Cop: "Are these your needles and crack pipes that I found in your car and jacket pockets?"

Burn out highschool kid: "No they're not! I swear to god they're not! I SWEAR TO GOD!"

Cop: Hmmmm.....
by kakarotch August 17, 2007
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1. Coined by college students P&S in honor of the popular belief that everybody has a twin somewhere.

2. The promise takes precedence of any other form of promise such as mother or God or the pinky. It protects the sanctity of mothers and of God so as not to desecrate these magnanimous personalities.

3. Replaces all other forms of swears with the unknown twin - one that you would wish to meet some day, and upon whom you would never wish ill.
by P&S July 21, 2006
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When two males want to enter into the deepest of the deepest promises that is so serious that it has come to this level. They wrap their penis’s around each other much similar to one would their pinky’s. They then make the promise that whatever needs to be done is done. The face to face proximity and the wrapping of the genitalia let’s each other know that this indeed is a grave promise.
Devon, are you sure Eric will come through for us?
Believe me Hunter, we did a Dinky Swear, you don’t go back on that
by Coop0345 May 12, 2020
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