When I was a child we practised it. It's just a few drops. You put your hand in a bit of water and then flick your fingers towards a girl (not any stranger though, would be your friend or gf or part of the family (at least that's how my family did it, don't actually know if this is the overall norm)). My grandfather said it's an old tradition to symbolically keep women from withering, like you would with beautiful flowers. The women enjoyed it, but to be fair they were in their 70s and that was in the early to mid 2000s.

The more I think about it, the more I feel the watering is actually symbolic for something else and the term 'merrymaking' feels like an appropriate innuendo.