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
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
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 ;"
by Simpy April 26, 2009
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug