Literally means: I just do't give a fuck, dont give a fuck, dont give a fuck etc. Turned into Fuss Dont Givva through extended use, usually said in a meaty,in yer face style, with plenty of saliva and lip movement. Inspiration comes from various shit rap songs.
Fred/ Harry/ Dejan/ Aidan: Shit! Mr. Kingman gave me a B for my essay on "Little Things".