Interjection
(in a Jewish context) Used to express congratulations or good wishes, especially at weddings.
(chiefly in non-Jewish contexts) Used to sarcastically express congratulations for an unimpressive accomplishment or in order to dismiss an accomplishment.
Source: en.wiktionary.orgMazel tov all around! Source: Internet
Mazel tov, April, Sydney Taylor Book Award Winner! Source: Internet
She understood the magnitude of the occasion and through her tears shouted, 'Mazel tov!' Source: Internet
Mazel tov you crazy white supremacist monsters. Source: Internet