To blow your hot, creamy load into your partner's anal orifice, then removing the aforementioned cream with your mouth, only to make out with your partner.
Felching is rooting around your butt for stuff. But you probably already knew that. I'm just gonna tell you how to use it in a sentence in nice company to see if they're game.
For example when you're waiting in line at a movie, you can say "does anybody know where "Felching in Bukakistan" is playing?