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2.
The husband of a MILF who cannot sexually fulfill their hot wife and is completely oblivious about it

See Steve Letourneau
Jacob is such a MILF dud because works long hours everyday while his wife sleeps with the pool boy.
by Ere May 17, 2007
 
1.
An older woman who looks good from behind or from a distance only to end up a turn off when observed facially up close or when naked.
"She was hot until she showed her face. What a milf dud"
"85% of women over 40 are varying degrees of milf dud"
"Usually I like sex with the lights on... unless she's a milf dud"
by jenno28 August 13, 2007
 
3.
A milf who looks hot from behind but then turns around and her aged face scares us back to females younger than us where we planned to go all along.
"5% of older women are sometimes hot. The rest are varying degrees of milf dud. If they were cuter in the face, more males would marry females older than us instead of constantly downwards. "
by Joggles28 June 30, 2007