Brian Limond was born on 20 October 1974 in Glasgow, and grew up in the Carnwadric and Priesthill areas of the city. After school, he studied printing, electronic publishing, and multimedia Technology before taking Jobseeker's Allowance. His mother died in 1995.
Scottish culture magazine The List listed Limond at number 14 in their Hot 100 list of 2006, which celebrated the people who made the biggest impact on cultural life in Scotland over that year. In March 2007, Limond took to the stage for two sold out appearances at the Glasgow International Comedy Festival.
In 2007, he played a character called Zack Eastwood in Consolevania and Videogaiden. In June 2009, the BBC commissioned a six-episode series of Limmy's Show, a Sketch show which premiered on BBC Scotland in January 2010. The BBC commissioned a second series of Limmy's Show, which premiered on BBC Scotland in February 2011. Limmy wrote a pilot for a sitcom based around Falconhoof, but the show was turned down by BBC Scotland. He made a cameo appearance in The IT Crowd, playing a window cleaner with an unintelligible Glaswegian accent in the episode "The Final Countdown", which aired in July 2010.
Limond has struggled with mental health issues such as depression and suicidal thoughts, as well as a history of alcoholism. He often openly discusses these issues on social media and in interviews. He is now teetotal. He has been in a relationship with Lynn McGowan since 2000; they have one son, born on 30 August 2010.
In 2014, Limmy had a regular segment in the second series of the Charlie Brooker news satire show Weekly Wipe. Limond is also known for his webcam chats, in which he interacts with fans and makes music.
Limond has appeared twice on Richard Herring's Leicester Square Theatre Podcast, once in 2015 and again in 2017.
In January 2016, he performed four nights at the Clyde Auditorium and one in London at the Hammersmith Apollo, adapting material from this TV shows to become Limmy Live!
On 1 May 2017, Limmy released his second book of short stories, titled That's Your Lot, embarking on a similar UK book reading tour to his first.