When somewhere along the way, your mouth and brain disconnect causing you to mis-say something, as if you made a typo but instead of typing, it is within speech.
rat-donkey: this is totally "nsfu"
me: what the fuck does nsfu mean.
rat-donkey: oops, i made a mouth typo. i meant nsfw
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When you say a sentence incorrectly, or use a wrong word.
Two examples of Mouth-Typo used in different situations can be seen below
"where do you want to proceed today?"
instead of the more understandable version
"where do you want to go today?"
or
"We will, We will Dwayne you"
(your mind is drifting away so you think of something else related to what your writing or saying about but it is incorrect)
correct version
"We will, We will rock you"
when someone mispronounces something you say mouth typo
Hey justin just mouth typo'd during presentation