male version of the brazilian wax, involving hair being waxed off the man's balls, butt crack, butt cheeks and pubic region

The more sophisticated successor's struggle: trying to ground science and meaning in logic and empirical data while wrestling with the realization that observation is theory-laden, and no final, pure "protocol sentence" exists. The hard problem is that the boundary between analytic (logic/math) and synthetic (empirical) statements, which the whole system relied on, turned out to be blurry. Quine's "web of belief" showed you can't test a single statement in isolation—you can always save a cherished hypothesis by adjusting other parts of the network.

When something sounds like a good idea but does wrong in practice. It can be used in place of BS, or to describe if something is awful.

Guy who acts like a douche bag but can be sweet when it comes to it

An introvert's crisis is a scenario when one can't decide whether to be alone because of their anxiety around people (except close relatives and friends) or make new friends because they feel lonely.