Stanislav Todorov Trifonov was born on 18 October 1966 in Pleven, Bulgaria. His father is from Gorna Mitropoliya, Bulgaria; his mother is Zdravka from Todorovo. He is the youngest of three brothers and has a sister, Petya, three years older than him, who he has said is the person closest to him. He was named after his grandfather Stoyo.

In 1985 graduated from SMU Panayot Pipkov in Pleven having learned the viola. He later graduated from the National Academy of Music in Sofia, Bulgaria.

Trifonov is the frontman of the Bulgarian music band Ku-Ku established in 1993 by Trifonov, Evgeni Dimitrov, Maestro Evgeny Jotov, and Ilia Iliev. The band has been / is playing a major role on the KU-KU, Canaletto and Slavi’s Show TV programmes, as well as other projects such as Fife Stars, Idols, Sing with Me, and The Voice of Bulgaria 1 and 2. It has released twentyone albums, over 300 songs, performed at hundreds of concerts, made thirteen tours including one in the United States.

In 1997, on show Canaletto he actively participated in protests against the rule of Zhan Videnov.

In 1998, he became producer and host of Exiles. The programme was suspended from BNT after a single broadcast on 8 February 1998. The show was later broadcast for two years by television 7 Dni TV and other cable TV channels in the country. It was distinguished by sharp political satire, and strong participation by the group Ku-Ku Band. The main script writers of Exiles were writers Rosen Petrov, Toshko Yordanov, Ivaylo Valchev, Ivo Petrov, and Siromahov.

On 27 November 2000 Trifonov made the first episode of Slavi’s Show on bTV. He is currently director of the production company Seven-eight AD. The company produces programming mostly for bTV and the bTV Media Group such as: 5 Stars, and numerous reality shows on license including Survivor BG, Music Idol 1, and Dancing Stars 2, and two mini-series Where is Brother? and Brandy and Sunrise.

As a singer he has released twenty-two albums, with Ku-Ku, Canaletto, Outcasts and Ku-Ku Band. He has made numerous tours throughout the country, as well as a tour in the United States and Canada. In 2004, he recorded a duet with the lead singer of Antique, Elena Paparizou, called Why?.

In 2005, Trifonov participated in the Bulgarian national final for the Eurovision duet with Sofi Marinova. When it came time to perform her song “Unity”, however, they took the stage and Trifonov announced, in an emotional speech, that they were withdrawing from the competition because the vote was manipulated using SIM cards.

In 2008, Trifonov was fined 500 lev(roughly $275 U.S.) for contempt. Trifonov has filed multiple lawsuits against so-called tabloid newspapers and has won the majority of them, donating their fines to charity. In early 2013, Trifonov condemned the company Magardich Halvadjian and Judy Halvadjian for misusing excerpts from “Slavi’s Show”.

On 6 May in Slavi’s Show, Slavi Trifonov announces that his show will end on 31 July 2019, and after 15 September Slavi and his team will create their own television, called 7/8 TV. In October 2019 on his Facebook profile Slavi announces when his television will start. The first television broadcast was on 4 November 2019.