What is Mdnf?
1.
Taking a "massive" dump and not flushing it. Massive Dump, No Flush
I took a MDNF in the CEO’s private bathroom.
See
2.
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 ;]"
See