A fork of Rural Dictionary
When one or two people dance with each other and it escalates to the whole world dancing with him/her/them in perfect sync. This effect is prevalent in Bollywood movies, hence the name.
"I saw a couple dancing to a catchy tune in the horizon and the next thing you know, I'm dancing with my friends behind the couple without any reason and nailing it on my first try!"
"That's the Bollywood effect."