1 definition by TTM123654789
Short for a computer painting software called "Paint tool Sai" or "Easy Paint tool Sai". It is known for also being simple to use for those learning how to draw on the computer.
"SAI is MS Paint and PS if they had sex."
guy1: "What program do you use for your drawings?"
guy2: "I use SAI."
guy1: "What program do you use for your drawings?"
guy2: "I use SAI."
by TTM123654789 January 24, 2012