when a human,or other living being becomes so stressed or pressured that they stop functioning. This usually lasts for an indefinite amount of time and can be accompanied by a stroke looking face and a loud "buuurrrrrrr" sound that the person makes out of smoke.
The calculus test was so hard that all of the students bottomed out.
The students bottomed out when they saw their AP Physics exam.
The mother couldn't help but bottom out when she aw how high her bills were.