Interchangeable with 'Cap'
The word 'crin' is used to signify a conflicting opinion over a false statement, in the same sense that cap means 'false' or untrue.
basically a way of telling someone they're a liar.
the only way of avoiding a crin is to say 'safety' if you know you're chatting shit.
'yeah bro trust me I got with too many tings last night'
'crin'