when one slips up in a conversation and eat their own words.
Luke told Jen that she hates Canadians. Jen then told Luke that she is actually a Canadian. Open mouth, insert foot.

I told Sam I'd bang Darren's wife 'cause she is so hot, when Darren was actually behind me the whole time. I practically opened my mouth and inserted my foot there.
by Baz S. October 4, 2007
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Something that horny Germans say while making jerk-off motions with their hands.
Marian said "open your mouth"
by jizzer March 12, 2005
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The act of verbally sharing or expressing dreams, ideals, or improbable plans with others as if they had some validity to them. An extension of the proverb "counting chickens before they have hatched", this phrase is the equivalent to not only counting the chickens, but generously distributing them out to friends, family, and acquaintances.
*Examples of Dream with one's mouth open.

A: My band is getting a really good response at facebook and we're getting more and more people following us at twitter. It's just matter of time before we're picked up by a label so we can release our CD and go on tour.
B: Stop dreaming with your mouth open. It's just sad...

A: Ooh, I'm going to be hooking up with someone tonight at the party.
B: Dude, didn't your mother ever tell you not to dream with your mouth open?

A: So she told me that she was talking to a massive client and that we should be getting some decent work soon.
B: Yeah, and she tends to dream with her mouth open. I wouldn't hold your breath.
by Otho Faure October 6, 2011
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A fun game boys play with drunk girls.
Maria said, "Every time I get drunk and a boy says close your eyes and open your mouth, I get a big fat cock in the mouth!"
by Buck Wild Nuts April 20, 2016
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A hot girl that you see looks quite attractive until she starts talking, Once you hear her voice you become immediately repulsed
Pat: did you see that bad bitty by the produce isle

Jeff: Yeah she looked Hot until she opens her mouth
by FullPissJug July 31, 2018
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Gary: stop chewing gum with your mouth open, are you insane?!
David: what's the big deal? it doesn't hurt anyone.
Gary: its annoying af!
by Video2Video June 18, 2020
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A Mouth-Wide-Open lip-spreader/mouth-gag is a device used in some S&M scenes. A pronged steel cock-ring is inserted into a bottom's mouth and fastened with a leather strap. He's blindfolded and handcuffed and his mouth is now ready for use. After being given 300mg of the boner-maker drug, Viagra, Boy may be forced to wear a cock-cage, leather ball-stretcher and puppy-dog tail
Once, I went to a leather bath-house with Matt, and somebody drugged me and I passed out! When I woke up, several dudes fucked me through the Mouth-Wide-Open lip-spreader/mouth-gag they forced me to wear, and I heard Matt talking, he had fucked my mouth too because I recognized his dick-shape and cum-taste when he shot his load down my throat - I blew my wad through the cock-cage they had on me and they made me lick it up!
by USAF Cadet February 3, 2021
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