A chronic issue where after you start to hit puberty, your body suddenly starts to conform back to the state of pre-puberty, and all gained puberty traits near instantly vanish in one swift sweep.
Similar to a voice crack, but for all of puberty's traits.
Guy: Dude, while I was in the middle of a voice crack, I suddenly experienced Pubescence Collapse Disorder; it felt so awkward.
Lax bro: Woah dude, that's so bro!