A typical chav slang expression that is used to describe something thats cheesy.
it is normally pronounced as "Cheddar" but is adapted slightly to make it sound more (badass).
Chadha is used in phrases to emphasise mainly on smell.
Ugh, thats rank! - I know... ugh, so chadha!
Hahaha, oh my, how chadha was that? thats so cliché...