The Red Devils speedster lifted up his shirt after being substituted to reveal a huge picture of a young boy playing football.
His artwork sees the footie-mad youngster kicking a ball around outside some terraced houses.
Rashford, 21, has not spoken about the meaning of his tattoo but it could be a nod to his first experiences of the growing game.
United's players certainly looked like they had rediscovered the joy of football as they secured a resounding win under new boss Ole Gunnar Solskjaer.
After months of dire performances, the superstars decided to put a shift in and ran all over the promoted Bluebirds.
Rashford's inking mirrors Manchester City rival Gabriel Jesus, who has his old neighbourhood on his arm.
He said previously: "I have four and all of them represent me a little bit.
"One is for faith, the other ones are one of Jardim Peri, where I was born and grew up with the dream of being a football player.
"The other completes the image of the neighbour of my childhood. The last one is the quote of my mom.
"I intend to have more tattoos about my career in the future."
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