Clinch fighting, possibly the most important aspect in the martial art of Muay Thai (also known as Thai Boxing). The attacker clinches his hands around his opponents' neck, and delivers punches (usually uppercuts), elbows, and knees to the face of the opponent while pulling his neck down. This is a very useful street fighting technique and is often seen in Muay Thai fights in Thailand and mixed martial arts competitions such as Pride Fighting Championship in Japan and Ultimate Fighting Championship in the USA.
"Holy jebus, Jon just dirty boxed the shit out of my girlfriend!"
"My friend knew Karate/Taekwondo/Kung Fu, but a Muay Thai fighter whooped his ass with dirty boxing."