knak sars is when something or someone really sucks

knak is a synonym for something really bad
sars is a lung disease
so knak sars is when something or someone really sucks

knak sars is when something is really bad or if something or someone sucks really bad.

knak is a synonym for something bad
sars is a lung disease and that is not nice to have...
so when something is knak sars, it really sucks!