What is "swaffelen"

Swaffelen (or zwaffelen) is a Dutch term meaning to hit one's penis—often repeatedly—against an object or another person's body. Swaffelen was named as the word of the year in the Netherlands in 2008.

The act of swaffelen often takes place in the form of teasing, crude humour or a degrading context, but can also be a sexual act. When the act is practised on a person, it is often the person's cheek that is hit. The penis is usually flaccid or semi-erect during the act.