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A person, usually male, who has a personality similar to that of a grumpy old man. This person is no fun, always appears tired, and tends to shoot down ideas. Voice is usually nasal, and pauses for a long time before speaking when in conversation and always wants to eat salty food. Tends to remind one of a duck (hence the name)
Person 1: Hey man, did you do last night's homework?
Person 2:.......No!
Person 1: Jeez ok. Did you get enough sleep last night?
Person 2:.......What do you think?
Person 1: Well I don't know that's why I asked.
Person 2:....... Do you have any peanuts?!
Person 3: Wow what a mallard

mallard duck 

Used in jobs where you are an instructor. You make this the perfect lesson plan, so when you stop caring about your job and a supervisor shows up to evaluate you, you look awsome.
Key Phrases in George Bush mallard duck speach: freedom, peace, oil
mallard duck by Matt$ April 26, 2006

Rubber Mallard 

A sex position in which the male hangs upside down by his ankles by a rubber cord attached to the ceiling. The female hangs on with her hands to whatever it is the male is hanging from, and this produces a nice bouncing effect with the rubber cord.

The term comes from the rubber cord used to attach the male's ankles to the ceiling with, and the term "mallard" is due to the fact that the male, when hanging upside down, resembles how a mallard looks when it is being hung upside down after being hunted.

The term is also the inspiration for a famous Ultimate Frisbee team, the "Rubber Mallards"
"What did you do last night?"
"Me and my girlfriend tried out the Rubber Mallard; it was amazing!"
Rubber Mallard by playa_h&f April 18, 2010

dirty mallard 

the act of scraping some duck butter from your grundle
and smearing it on one's face, often under the nose and above the lip, like a dirty sanchez
Joe: what's that on your face?

Bob: that nasty fuck over there just gave me a dirty mallard

Joe:....tisfu
dirty mallard by Blake C. June 16, 2008
Similar to the fuck boys vs real mo fuckas. Kinda like the good ole sayin about ignorance and stupidity. As RGB would say "some mallards can be fixed"
FUCKIN MALLARD!
Mallard by THE METHOD January 9, 2020
A poorly thrown ball, almost a lob, that is usually intercepted by the other team
Our quarterback threw a mallard right to the other team
Mallard by Yeetyboi8 January 11, 2020