a) an infamous massacre committed by Al Capone on St Valentine's Day 1929
b) when one breaks up with their significant other on St Valentine's Day
Do not commit a St Valentine's Day Massacre, definition b) , on your significant other.
by Sexydimma March 4, 2015
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a) an infamous massacre committed by Al Capone on St Valentine's Day 1929

b) when one breaks up with their significant other on St Valentine's Day
Do not commit a St Valentine's Day Massacre, definition b) , on your significant other.
by Sexydimma December 8, 2014
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Have some girls get on their knees in a line. Proceed to take your pants off and bunny hop down the line, slapping the girls across the cheek with your cock.
Girls get down, I am about to perform the St. Valentine's Day Massacre
by studmuffin March 8, 2005
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(Referencing Al Capone's Valentine's Day Massacre of 1929)

When you break up with your girlfriend on St Valentine's Day.
If you are not a misogynistic son of a bastard do not commit a St Valentine's Day Massacre on your girlfriend.
by Sexydimma September 24, 2014
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