Someone who doesn't give a fuck.
Niall Horan is the most carefreemofo in the world.
by Always Wrong October 07, 2012
1 more definition
Niall Horan from the biggest boy band, One Direction, is the biggest carefree mofo. He doesn't care. Niall Horan doesn't give a fuck.
Care free mofo doesn't need an example
by britishandirishboys June 18, 2013