An expression that become popular in the American Midwest during the late 1800s meaning “the murder of a bastard child”.
In that era, “getting slapped” was a slang term used by lower class citizens for “getting killed” and “cheese” was used as an insult for children of, what late 1800s folk considered, whores. Older ways of making of cheese were considered disgusting and smelly by most so the child-shaming general public used it as an insult.
The combination of the two slang terms birthed the expression, “Slap Cheese”.
“Holy shit, Phil! What is the corpse of a child doing bleeding all over the place in my house?”
“I’m sorry, Randy. I adopted him recently, but then I found out he was a bastard so I picked up a pool cue in my rage and did a messy Slap Cheese.”
“Next time do your research before you ruin my carpet.”
Slap cheese day is where you hit cheese