Green’s Dictionary of Slang

(US) silly behaviour, esp. romantic or sexual.

1970		Current Sl. V:3 10: Mufki pufki, n. Light or moderate petting.
1988		Sun (Baltimore) 29 Dec. 🌐 Come off it. It’s mifky-pifky in the bushes.
2000		N.Y. Times Bk Rev. 1672/2: Nor does he equate Nixon’s systematic effort to undermine constitutional government with a few incidents of mifky-pifky in Clinton’s Oval Office.