point of inflection 

Calculus: A point at which the concavity of a mathematical function changes. Points of inflection occur where the second derivative f''(x)=0, and where f'''(x) doesn't =0.

OF COURSE this is urban slang. "Whazzap wit da point of inflection, biatch?"

point of inflection by Aaronak January 14, 2005

Point of inflection 

When, proverbially speaking, shit hits the fan, especially when one is talking about the us house ofrepresentatives.

If you don't know what a point of inflection is, look at the 2018 us midterms, when the squad was born.

Point of inflection by Uncle Dimma May 24, 2021