From Longman Dictionary of Contemporary Englishcrocodile tearscrocodile tearsPRETENDif someone sheds crocodile tears, they seem sad, sorry, or upset, but they do not really feel this way → crocodile
Examples from the Corpus
crocodile tears• So much for the exiles' crocodile tears over Elian's removal.• That is why we should regard Labour's albeit genuine crocodile tears as extremely salty.• You will notice phrases like crocodile tears, the elephant never forgets, and the ostrich burying its head in the sand.• But far be it for us to shed crocodile tears over the bruised egos of our male counterparts.• They weep crocodile tears for the poor and disadvantaged, but are basically happy with things as they are. 