It's the 'Condom Snorting Challenge'. It's been done before in years past but recently has gone viral again. You basically snort an unused condom up your nose..inhale until it comes out of your mouth. The main reason is for 'likes and views', and yea personally I really don't get it.
There are definitely other ways to get attention. You could damage the lining of your noise + cause an allergic reaction which leads to an infection. That's just a few possibilities so yea probably a good idea to stay from it....just sayin:) Check out more about it here.