A groin attack is an attempt to cause pain to the groin area of one's opponent. The technique can be quickly debilitating, due to the large number of sensitive nerve endings in the penis and testicles of males, as well as the highly innervated vulva of females. A sufficiently powerful blow may fracture the pubic bone of the victim, resulting in physical disability. They have been popularized as a comedic device on programs such as America's Funniest Home Videos, professional wrestling, and YouTube.

An attack to the groin is considered to be a "low blow" not only in the literal sense, but is the origin of the metaphor. In a playful attack, or attack in the framework of a sport, a low blow is seen as unfair or improper and is often considered dishonourable. Strikes to the groin are almost universally forbidden in martial arts competitions, including boxing, kickboxing, and mixed martial arts competitions where full-contact strikes are normal and permitted. Testicle attacks were, however, allowed until the 1980s in international Thai boxing (Muay Thai) and are still permitted in Thailand itself (though the boxers wear cups to lessen the impact). Many martial arts organizations require competitors to wear protective cups against accidental blows, as do many other sports. Direct strikes to the groin are generally considered illegal in professional wrestling as well. However, in certain "hardcore" matches the rules are relaxed and such attacks are allowed by mutual consent. In a hostile attack outside of sports, a low blow may be considered more appropriate as a self defense technique. It is often, though not always, effective.

Christina Applegate (born November 25, 1971) is an American actress. She is best known for playing for the role of Kelly Bundy on the FOX live-action sitcom Married... with Children. Since then, she has established a film and television career, winning a Primetime Emmy and earning a Tony and a Golden Globe nominations. She has major roles in several films including Don't Tell Mom the Babysitter's Dead, The Big Hit, The Sweetest Thing, Anchorman, Farce of the Penguins, Alvin and the Chipmunks: The Squeakquel, and Hall Pass. She has also starred in numerous Broadway theatre productions such as the 2005 revival of the musical Sweet Charity. As of September 2011^[update], she is starring in NBC's comedy, Up All Night.

Applegate was born in Hollywood, California. Her father, Robert W. Applegate, was a record producer and record company executive, and her mother, Nancy Lee Priddy, a singer and actress. Her parents split up shortly after her birth. She has two half-siblings (Alisa and Kyle) from her father's remarriage. Following her parents' divorce, her mother had a relationship with musician Stephen Stills. It was through Stills' friendship with fellow musicians Paul Kantner and Grace Slick that Applegate became friends with their daughter, China Kantner.