The fat hit the fire phrase
A situation or circumstances that get frantic and disagreeable all of a sudden.
They had been arguing for half an hour, then the fat hit the fire and they charged at each other.
The number of healthcare workers had already seemed insufficient, but the fat hit the fire when the pandemic broke out.
The origin of this phrase is not clear.
Suggest someone or oneself for consideration in a selection, such as a competition, application pool, election, etc.
Kamala Harris is expected to put her name on the hat for the US president.