put your foot in your mouth

Put your foot in your mouth is a phrase used by someone who admits to just saying something stupid or embarrassing in front of other people. Usually someone will mention out loud they have just put their foot in their mouth because they said something which embarrassed them or was stupid for whatever reason and after they realized it, they felt very embarrassed about it. Putting your foot in your mouth is another way of saying you wish you could have not said it.