Song written by Pete Lee, Steve Nesfield, Paddy O'Malley, Kim and Ricky Wilde, and recorded by Kim Wilde and Lawnmower Deth and released in December 2017. Kim joined Lawnmower Deth on stage during Download festival in 2016. Shortly afterwards, the collaboration on a new track was suggested. Pete Lee, vocalist for Lawnmower Deth, said the collaboration was "the greatest project [the band has] been involved in". The song has been described as an "anti-Christmas song" and a "punk and thrash-metal crossover number with thrashing riffs and hardcore vocals".
The single is released on December 15, 2017 via digital download with a physical cd-single release also expected.
There are two versions of 'F U Kristmas': the clean version and the sweary version.