Bukake, Bukakke, Bukkake parties
Bukkake is a Japanese word for the act of men wanking and cumming over a willing naked girl (or sometimes a naked man).
Bukkake nights are very popular and adverts can be found for these parties almost every week in the UK. We have not seen any advertised here in Spain yet, though it won't be long before they start here as well.
As the word is a Japanese one, there is a lot of debate about the correct spelling. You may see it spelt Bukkake, Bukake or Bukakke.