Festerpool

To think about multiple negative thoughts creating a festerpool of negativity resulting in situations appearing far worse.
A festerpool of high emotions can result in riots.

A person was upset due to debts building up, their mind began to pile all theirs worries creating a festerpool of depression.

Foul cloud

The pocket of air following a person breaking wind

He was nearly sick when he walking into the foul cloud from Mich's fart