A fusion of two words: Sarcastic and Bastard. Many bastards are sarcastic and vice versa. Hence this great word which I made up and should have patented, though it will most likely never catch on with the masses.
That guy is such a sarcastard.
Someone who is retarded at picking up on sarcasm.
"millionaire is the worlds greatest show!"
"i know right!!! i lurv it sooooo much!"
"uh, dude, sarcastic, you are such a sarcastard!!"