mdnf

Taking a "massive" dump and not flushing it. Massive Dump, No Flush

I took a MDNF in the CEO’s private bathroom.

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mdnf

the hipster way to say "my dick needs fucking"

often thrown into random conversations

"hey joe whats up"
"MDNF!!!"
"WTF does that mean?!?!"
"oh; you know ;"

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MDNF

Acronym- Minors Do Not Follow
Used by Twitter accounts that post explicit content or are just not comfortable having to watch what they post because they have kids around.

The hornyposting account had MDNF listed in the name