돌+i(아이)/저질댄스/oo이로구나 - 노홍철

• Dol+I (아이): Pronounced "Dohl-ai." This is a portmanteau of "돌" (dol, meaning stone or crazy) and "아이" (ai, meaning child or the English letter 'I'). It's a softened version of "Ttorai" (또라이), meaning "crazy person."
• Jeojil Dance (저질댄스): Pronounced "Juh-jil Dance." "Jeojil" means low-quality or vulgar.
• OO-iroguna~ (OO이로구나~): Pronounced "Oh-oh-ee-roh-goo-nah~." This phrase means "So it's OO~," where OO is a placeholder.
• Noh Hong-chul (노홍철): Pronounced "Noh Hong-chul."

"Dol+I" originated on October 7, 2006, during the MBC 'Infinite Challenge' Chuseok special, 'Infinite News' episode. It came about when Noh Hong-chul referred to himself as an "idol," and Yoo Jae-suk suggested, "It would be better if you reversed the order of the words." It temporarily disappeared from broadcasts in 2010 due to a directive from the Korea Communications Standards Commission but began to be used again starting with the 'Hawaii Special' in August 2012. Its usage expanded further, becoming Heechul's nickname on JTBC's 'Knowing Bros' in 2016 and Jeon So-min's nickname on SBS's 'Running Man' in 2017.

"Jeojil Dance" was first showcased by Noh Hong-chul in the 2005 'Muhan Dojeon Dehydrator vs. Human' episode. It reappeared in the 'New Semester Special' in March 2007 and was actively promoted on broadcast starting from April. While its appearance on shows was restrained after the 2008 'Aerobics Special' and 2009 'New York Special,' it was performed again at the MBC Gayo Daejejeon in 2018.

According to Noh Hong-chul's own definition, "Dol+I" refers to a 1% talented individual who, though different from ordinary people, brightens the world with an undeniable and immense charm. Generally, it describes someone who acts eccentrically or unpredictably. However, it is used with a softer nuance than the vulgar term 'Ttorai' (또라이), similar to "quirky person" or "eccentric." It was also used on broadcasts as a substitute for 'Ttorai' to avoid censorship.

"Jeojil Dance" refers to the unique and shocking dance performed by Noh Hong-chul on 'Infinite Challenge.' It is considered the ultimate "Dol+I" special skill for Noh Hong-chul, who is severely uncoordinated and has no sense of rhythm. Though it involves simple movements like spreading both arms like wings and thrusting the hips, its defining characteristic is its awkwardness and embarrassment. Noh Hong-chul's "spaced out" expression while dancing is also a crucial element of this dance.

"Dol+I" became widely known among viewers of all ages who enjoy Korean variety shows, thanks to the immense popularity of 'Infinite Challenge.' Beyond just fans who appreciate Noh Hong-chul's unique character, its usage expanded as a nickname for various celebrities and athletes, leading to broad public adoption.

"Jeojil Dance" is a familiar meme to viewers of all ages who watched 'Infinite Challenge' and remember Noh Hong-chul's distinctive character and physical comedy.

Not specified in the source material.