Ehm, I know many curses and stuff, but I'm not sure if they'll be useful for that time xD
I guess if you're talking about Spain, you could use the word "Gilipollas", that's like saying 4sshole or jerk, that's a common word over there, also "Capullo", that's like saying dumbass, or "Cabrón", that's also a despective word..
To say something agressive like you just did could be "¡Atrapadlo!" (get him!), "¡Te arrancaré la piel!" (I'll skin you alive), "¡Disparadles!" (Shoot them!) .. I really don't know what else to help you with, I guess if you think about some sentences I could just translate them to you, trying to put some old castillan accent.
If it helps here's also this article xD
http://en.wikipedia.org/wiki/Spanish_profanity