It means when you are in awe to see or hear something or someone.
Holy moo cow did you see that Yak!?
A cow that does not moo, unlike the moo-cow that actually moos.
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God damn my baby moo cows are sore from running today!!
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A very fat woman, can be used as an insult directed toward a guy, could imply that said guy likes "Moo Moo Cows"
Alex: you Moo Moo Cow!!!!
Carter: I only nudged into you, Jesus effing Christ!
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A word describing a male with a large head who also has large eyes that extend from his face, looking like a cow.
The Needhams have moo-cow eyes.
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The idea that once a man sleep with a woman, she becomes 'old news' and he is no longer intrested in her. To sum up, it means that men genitically cannot have commitment. As stated by the movie Someone Like You
"I don't understand how he could cheat on me!"
"It's simple, The Moo Cow Theory"
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