Slap my knee 

A word used by old people back in the 1900's when something was funny

A very white saying only used by a special white race never exposed to society

'Back in the olden days Jimmy Savile used to really Slap my knee' said Grandfather John

Slap my knee by wiji board October 14, 2018

Slap my knee and call me pickle 

An expression of enlightenment and revelation concerning information that was previously unknown.

Sam and J rode down highway 81 to the honky tonk bar. A Wheeler Walker Jr. song played over the truck radio - Eatin Pussy, Kickin Ass.
Sam looked at J. Her eyes glistened with regret.

"J, we have a situation," Sam said.
"What happened?"
"I seem to have shit my pants, J"
"Well slap my knee and call me pickle, Sam," J muttered. "I'm turnin' this truck around baby."

Slap my knee and call me pickle by ChandlerHasStrongShoulders March 26, 2022