What is Roll On?
1.
To snitch or divulge private information about a person. Mainly equivalent to snitch though, used in criminal terms.
To snitch for some sort of protection or legal incentive.
"Shiiit son, why the fuck am I in jail? My friend got out on parole!"
"Hah, stupidass, he rolled on you!"
"H-He wouldn't roll on me...I think..."
"Hah, your ass is grass!"
See
2.
Marijuana rolled onto a cigarette with either cigarette paper or a blunt wrapper.
Yo $kip, you gots any
Bambu , cause I wanna build me a big roll on.