The singles "Smack A Bitch", "Poppin" and "Key Lime OG" gained prominence in early 2018; all of them meeting and exceeding 10 million YouTube views in that year. The former two songs additionally gained some popularity on the video-sharing platform TikTok after being using in various memes. "Smack A Bitch" was also ranked at No. 2 on The Fader's list of "The 100 Best Songs of 2018". The aforementioned influx of popularity helped Rico Nasty catch the attention of Atlantic Records, where she signed and released her sixth mixtape and major-label debut, Nasty, in June 2018. The mixtape was generally well received and landed on critics lists of publications such as Rolling Stone, Pitchfork, Stereogum, Noisey, Fact, and Spin, among several others. The mixtape's tracks, "Bitch I'm Nasty", "Countin' Up" and "Rage", were also ranked on lists of the best songs of 2018 by Paper, Highsnobiety and Pitchfork respectively. In late July, Rico Nasty embarked on her headlining The Nasty Tour to support the mixtape, playing twenty-seven different venues across North America over six weeks and completing the tour in early September.
Rico Nasty coined the term "sugar trap" early in her career and has used it as the title of her independent record label as well as two of her mixtapes. Musically, the term has simply been described as "bubbly, upbeat rap" as well as "singing and trap rapping". Lawrence Burney of Noisey noted that sugar trap is "markedly upbeat, bubbly, and self-loving, no matter her chosen delivery", while Kyann-Sian Williams of NME described it as a blend of "hardcore, gruff vocals" and "grungy hooks with softer, computerised beats". Rico Nasty said that sugar trap "soft, beautiful, melodic, flowy vibes" as well as "trap music like Chicago drill music, Atlanta trap music, Memphis trap music, little bit of California trap music. I mix everything. If the sound catches my ear, I mix it." She has also described "sugar trap" metaphorically as "a headspace", "a way of fashion" and "a way of life". She also described the term as a "metaphorical place", saying "It’s like when you have a really, really bad life and shit good starts happening and you don’t know how to adapt to the good shit." In April 2018, Rico Nasty officially trademarked the term "sugar trap".