A fork of Rural Dictionary
This means big up the boys if you all in a crowd you all shout big up the massive and everyone knows that you have arrived to the party
This definition is another term for swear down
1 : ‘Did you really punch that lad in the face last night’ 2 : ‘yeah square brown I did’
in other words mattress back describes a fat person you can use it for all people like if they are skinny you would say you single matback and if they are fat you call them a double matback