The Griddy's monumental run might've come to a screeching halt on Monday -- Justin Jefferson's famous celebration made its way to Bachelor Nation ... and it's every bit as cringe as you'd expect.
It all went down during the first episode of the new season of "The Bachelor" ... when contestant Madison Johnson inexplicably showed up for a second round of one-on-one time with leading man Zach Shallcross -- despite other girls not getting the chance to sit down with him yet.
Madison decided to use her bonus round with Zach -- a former football player for Cal Poly --to put their Griddy skills on display .