In parts of India, men covered in white stuff?

I'd tell you but I can't as I don't know what it is I'm supposed to Google, you utter twit.

Most likely you are asking about Holi, which is a Hindu spring festival.  It originated and is predominantly celebrated in Nepal & India but has also spread to other regions of Asia and parts of the Western world through the diaspora from the Indian subcontinent. The "white stuff" is called kumkuma and is a powder used for social and religious markings in India. It comes in many colors. Holi is sometimes called the festival of colors. During Holi people smear each other with colors and drench each other. Water guns and water-filled balloons are also used to play and color each other. Anyone and everyone is fair game, friend or stranger, rich or poor, man or woman, children, and elders. The frolic and fight with colors occurs in the open streets, parks, outside temples and buildings. Groups carry drums and other musical instruments, go from place to place, sing and dance. People visit family, friends and foes come together to throw colored powders on each other, laugh and gossip, then share Holi delicacies, food and drinks

If you mean the naked holy men - Yogis and Sadus - they are covered in white ash.

Ed. To the two people who suggested Kumkuma, the main characteristic of this is that it *isn't white.*

Most likely Kumkuma, a powder made from tumeric.  Additional information below.

https://en.wikipedia.org/wiki/Kumkuma

White guys can't black-up but they can white-up.