Wiktionary
slap and tickle
n. (context colloquial idiom English) Mild or playful kissing, cuddling, and other amorous play.
Wikipedia
Slap and Tickle
"Slap And Tickle" was the fourth and final single released from Squeeze's second album, Cool for Cats. "Slap and tickle" is a British euphemism for sexual activity or police brutality. The track peaked at number 24 in the UK Singles Chart.
The track "Slap and Tickle" is also featured on two of their albums; Cool for Cats and Spot the Difference.