AFIMD [Anti-Foot In Mouth Device] 

The part of your brain which kicks in at the last second and prevents you from saying something incredibly stupid.

He was about to ask her about her pseudopregnancy, when his AFIMD Anti-Foot In Mouth Device kicked in and closed his mouth for him.

AFIMD [Anti-Foot In Mouth Device] by Thinkingman.com January 21, 2011

man foot in mouth disease

When a dude says something stupid.

Dude said some really stupid stuff to her- has a case of man foot in mouth disease.

man foot in mouth disease by Jammer2014 January 28, 2014

put your foot in your mouth 

Saying something that makes a person feel pain or embarrassment.

I had to second-guess you for a while for putting your foot in your mouth.

put your foot in your mouth by Mr. Terrence L. Trezvant April 27, 2005

sticking his foot in his mouth 

To regret saying something harmful, insulting, or stupid to someone

Kyle : How is John doing?
Sarah: He has been dead for 5 years now
(Kyle is sticking his foot in his mouth) not literally

sticking his foot in his mouth by SlickNick6497 November 19, 2013

Chronic Foot in the Mouth Disease 

Exactly what the term implies. It refers to someone who seem to always say the most inappropriate thing at the most inappropriate time.

Commonly also referred to as CFMD. There is no known medical cure for this ailment. It tends to be hereditary and is usually passed down from the father's side of the family. Typically the gene is passed from father to son but it has been known to appear in females. Sufferers of this malady also tend to lack class and moral terpitude especially when surrounded by groups of people. They also tend to tell really inappropriate jokes that includes racist and or sexist comments and wonder why they are still single.

Guy with CFMD: Wow you have nice tits.

Hot chick in bar: OMG! You are crude.

CFMD's Wingman: You can't just say that to a stranger especially some hot chick you have no chance with. You must have Chronic Foot in the Mouth Disease like your daddy.

Chronic Foot in the Mouth Disease by activestatic July 15, 2010

e-foot in the mouth

the unfortunate mishap of sending an e-mail to the ABSOLUTE WRONG person by mistake. This is especially likely if you are forwarding an e-mail from said WRONG PERSON to a friend, in order to provide your friend with a sound example of the type of idiocy you described so eloquently in the e-mail. Since you are forwarding, you end up replying, and VOILA! the WRONG PERSON has an email that says, "Look what this bitch said to me?" and scrolls down only to find the very same e-mail she sent you yesterday.

When i received a reply from my customer, telling me he would not be needing my services, i scrolled down only to find the e-mail i MEANT to forward to my manager, wherein i called the customer a Fucktard (see Fucktard for definition).

e-foot in the mouth by R2 May 20, 2005

put one's foot in one's mouth 

To say something that one will regret,to make an error.

To put one's foot in one's mouth is the same as stepping in it.

put one's foot in one's mouth by Light Joker April 27, 2006