Maen all!
@Dina: Three times I heard that question this week! First, I'll give the standard reply: It is a program that creates arguments and fighting between its users.
It's in the name.
Second, the real answer: It's a chatting/voice chatting app that works across all platforms (android, iOS, windows, etc) and there's even a web based version that can be accessed through any browser. I sometimes use it when gaming online, but I prefer teamspeak where available, as it's much more specialized.
In other news, I spent two hours today delivering calf from a first-time cow. I believe it's called a heifer?
Muscles are burning, and my nerves are shot. I'll go grill some meat now and relax with a shisha, tea and a book.