狗屁真心

A rather informal or vulgar way of expressing the disbelief in sincerity or true feelings. It suggests a sarcastic or cynical view on so-called 'sincere feelings'. The phrase combines a dismissive expletive ('dogshit') with the concept of 'true heart' or 'sincerity' ('zhenxin'), hence rendering it as utterly untrue or absurdly insincere.