A word used by wiggers to indicate agreement or a non-aggressive attitude toward something that could have been seen as a threat to their alleged manhood.
It is a bastardized form of "It's cool, dawg." Which due to their lack of coherency becomes "'S, coo', daa", or for simplicity's sake, Sicuda.
I accidentally bumped into a 71-IQ wigger-kid and I apologized. he said "sicuda."
So nothing happened after that.