The Real meaning is a certain style of everything you do (walking talking, slappin, etc.) that has a very flavorful pimp influenced appearance to it, its lightly dirty and puts a big "I don't give a Dam" in somebody's face.
origination is old but Mac D R E pushed it to it's limits~!
it can also be put into noun form, "SAUCE"
I'm way too saucy for your scrawny ass bitch
Dont make me have to open a can of sauce on your ass - Mac Dre
filled with sauce to tha rim