Someone not ready for the real world (the big sea -- they're restricted to the mud, not even ready for wading in the shallows). Used by some in the navy as a disparaging term for marines and coast guard. Used also in amateur radio for people whose broadcast is weak (and therefore come through muddy with too much noise and not enough signal).
Wait here, mud duck, and let me show you how it's done.
by Eng Monger August 04, 2016
by j-tits June 19, 2007
by cook'ems August 18, 2016
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A female who is aware of the fact that her sole purpose of your friendship is to fuck you whenever u want.
She isn't my girlfriend, she's just a Mud Duck!!!
by Waldo the Wolf May 04, 2017
A gay guy. Deragotorally said like faggot. Basically a guy that likes to give/receive from the rear, thus the mud reference.
As in a battle rap:
"Look how u dress and look how u act
You more light in the foot than tar is black, matter fact,
You must be out yo' head messin' with an all time great.
I swings from only one side of the plate.
So sorry fag, you run outta luck
I don't runs wit mud ducks
You or your lyrics will never get close to me
So stop kid before u show ur true inferiority
"
"Look how u dress and look how u act
You more light in the foot than tar is black, matter fact,
You must be out yo' head messin' with an all time great.
I swings from only one side of the plate.
So sorry fag, you run outta luck
I don't runs wit mud ducks
You or your lyrics will never get close to me
So stop kid before u show ur true inferiority
"
by Infamus K72 May 18, 2007
by Mightiest_mortal October 20, 2004