Oh, I haven't made one of those in forever ... Why not, your given word is not worth much if you cannot keep a promise, even one as casual as a pinky promise.
Oh and for those that asked: To pinky swear, or make a pinky promise, is the entwining of the little fingers "(pinkies)" of two people to signify that a promise has been made.
I do pinky swear only with my little niece ,and of course in this case I always keep my word, with other people eish I try not to promise things because I know my luck -I promise something and then other thing happens and change a plan..
Ah! Is that pinky swear? Well in Nigeria entwining the finger with another person is an act done when u swear to make good your threat. Like saying u are gonna deal with someone. Then you tell him "bet me!" . You rivals entwin your fingers and one of you uses his other hand to knock the fingers loose. It's a bad act! Anyways I don't swear