@deCarabasHJ Yeah, it's a pinky promise/swear. There are variations on the exact wording you use, but basically you say a line like that while your pinky is linked with that of the person you're promising. Or, if you're asking if it's referencing a specific anime or something: it's a line from the opening song of Goshuushou-sama Ninomiya-kun. Not a series I could call particularly good (possibly not even good), but one I have a soft spot for, for whatever reason. And I found the opening really catchy at the time and still listen to it occasionally.
Edit: The ending song too, actually.
@VF89 Ah, I see, so it's the description of passing out that you were specifically referring to. I've never reached that level of rubbing mastery myself. Sorry for misunderstanding your lewd joke :x.