The stench that occurs when visiting the unwashed abode of someone who lives in there own filth. The smell will most likely stick to your clothes and a shower is definitely in required to eliminate the smell. (Deemed flat stench as it is most common in small stuffy flats with terrible airflow)
Saul: It stinks in here.
Callum: Its the Flat Stench.
Saul: I can never get this out Yeah, I've already washed my converse shirt like 7 times it's putrid intoxicating wank is almost impossible to evade