Green’s Dictionary of Slang

prinkum-prankum n.

also princum-prancum
[redup. of SE princome, a prank, ult. SE prank; also prinkum-prankum, ‘a round dance, formerly danced at weddings, in which the women and men alternately knelt on a cushion to be kissed’ (OED)]

1. a trick, a game, a prank.

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[UK]Nashe Have With You to Saffron-Walden in Works III (1883–4) 191: I will not present into the Arches, or Commissaries Court, what prinkum prankums Gentlemen (his nere neighbors) haue whispred to me of his Sister, and how shee is as good a fellow as euer turnd belly to belly.

2. sexual intercourse.

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[UK]T. Randolph Muses’ Looking-Glass V i: No wanton Jig, I hope, no dance is lawful But Prinkum-Prankum.
[UK] ‘On a Tinker’ in Ebsworth Choyce Drollery (1876) 52: All maids desire him to stop up their holes / Prinkum Prankum is a fine dance, strong Ale is good in winter.
[UK]W. Davenant Play-House to be Let Act V: Yes! let ’em play at but princum and prancum.