Coal rolling is a 'Family Sport' in which a badman sits with fam and rolls a block of coal down a hill. The quicker it gets to the bottom. The cooler the Dooper!
'Omg did you see that bois rizzz?'
'Yeah baby he's the coal rollingcowboy of the North'
A rolling stone gathers no moss; with some exceptions.
Some people just can't bear the single life, so approximate the rolling stone life by forming a conglomerate stone that they hope will survive rolling without fracturing.