Oberkante Unterlippe
When something is right at the point where it can't go any further, like a drunk man trying to dance.
That kid was at Oberkante Unterlippe with his GPA, one F and he’s history.
The cake was at Oberkante Unterlippe, it was about to fall apart like a bad relationship.
Her patience was at Oberkante Unterlippe, one more joke and she’d have yelled at the whole class.