A Midnight Moo is the act of defecating on another person's face as the clock strikes 12. The person committing this act must also MOO like a cow simultaneously.
Tim: "Yo bro, Nick was being an asshole last night; lets fucking give him a midnight moo tonight."

Bob: "Totally dude. Lets get his ass"
by Brosif Kony March 20, 2012
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Midnight moos is when you have a girl over but she was gross, or just bad! Like a cow.. moo
“bro, how was last night, was she good??”
nah fam, it was midnight moos”
jeez, she must of been bad”
by Punanichicken December 12, 2019
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