From Longman Dictionary of Contemporary Englishhonest to Godhonest to GodspokenTRUE used to emphasize that you are not lying or joking Honest to God, I didn’t tell her! → god
Examples from the Corpus
honest to God• Honest to God, I wasn't there.• "Are you on drugs?" "No, honest to God, I'm not."honest to Godhonest to Godinfml used to emphasize that you are not lying or joking Honest to God, I didn’t tell her! → Godhonest to Godhonest to GodspokenTRUE used to emphasize that something you say is true Honest to God, I wasn’t there. → honest 