hella mad means: It’s not mad, but it is mad. You’re just like, “Wackass Bullshit” It was one of your friends who fx’d it up. (in Community Dictionary, added by Denise Duarte)
What else does hella mad mean?
- It’s a scoundrelous madness. It’s not serious madness, it’s just that you are stating hella mad in a funny kind of way. (in Community Dictionary, added by Victorino Martín)