an older person who is very happy about life & the things around him.
Brian: "Damn Carl, I only had 2 pieces of chicken out of that 12 piece family box last evening!", "you're such a pig!"

Carl: "Yo slap-happy-grand-pappy!"
by T.Wilson January 1, 2013
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An old man that loves to slap during sex.

(From Diary of a Wimpy Kid)
Jared: Oh, man. My dad's a Slap Happy Grand Pappy
Mike: Sorry to hear that.
by SeevaGooner March 28, 2023
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