The Grump comes from my granddaughter who's miserable bitch of a Mother insisted the kids not call us nan and granddad but must be Grandma and Grandpa.
Poor little thing could never say it used to call me Grumpa and still I am Grumps to her.
A dear departed friend Rod suggested that I use it. Therefore I do.
Wotchya Walter & WD40 how are ya?