What is "krumping"

n. (context US especially Los Angeles English) A free, expressive and energetic style of hip-hop dancing.

The dance known as Krumping is a street dance popularized in the United States that is characterized by free, expressive, exaggerated, and highly energetic movement. The youths who started krumping saw the dance as a way for them to escape gang life and "to release anger, aggression and frustration positively, in a non-violent way."