Top Definition
Taking a "massive" dump and not flushing it. Massive Dump, No Flush
I took a MDNF in the CEO’s private bathroom.
by Nathan November 09, 2004
1 more definition
5 Words related to mdnf
the hipster way to say "my dick needs fucking"

often thrown into random conversations
"hey joe whats up"
"WTF does that mean?!?!"
"oh; you know ;]"
by Simpy April 26, 2009

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