“‘Wet leg’ is a term that inhabitants of the Isle of Wight, where Teasdale and Chambers grew up, apply to day-trippers and holiday-makers who ferry across the five miles from Southampton, on England’s southern coast. (‘D.F.L.,’ short for ‘down from London,’ and ‘overners,’ from ‘over the water,’ are others.)”
https://www.newyorker.com/magazine/2023/01/23/the-women-of-wet-leg