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1.
An exclamation used when something awesome has just happened.
Slamacow! That was tops! Who's not good at math? I was all "four!"
by Finn the Human Boy January 15, 2011
 
2.
An expression used when something surprising or upsetting occurs.
Ex. 1:
16-year-old girl - "Mom, I'm Pregnant."
Mother- "SLAM-A-COW!"

Ex. 2:
*Baker drops wedding cake on the ground*
"Slam-a-cow!"

Ex. 3:

Girl - "I don't want to have sex until I'm married."
Boy - "Slam-a-cow!"
by raindropkisses October 02, 2010