Rarely used contraction of the phrase "may not".
Student: Teacher, may I go to the bathroom.
Teacher: No, you mayn't. You should've went before the class started.
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" May we come in?"
"... No..No you "mayn't"
Featured in the show Sam and Cat.
May Not (contraction form) (previously undiscovered)
You mayn't use my wallet to pay for that crap.