told you so
Clipping of I told you so.
told-you-so
The four most beautiful words in our common language: I told you so. Gore Vidal
There's nothing I find quite as annoying as the phrase 'I told you so.' Ayelet Waldman
There are girls, few perhaps but to be found if one searches carefully, who when their advice is ignored and disaster ensues, do not say "I told you so." P. G. Wodehouse