A crappy piece of software that should no longer be used but has been left around for backside compatibility. A portmanteau of defecate and deprecated.
A compound word from; Defacate- To void feces from the bowels or "Shit", and the word Definitely- Refers specifically to a judgment or description that serves as a standard or reference point for others or "Ya". Baisically Shit Ya!
Steve-
"Hey Gregg wanna get jacked out of our minds with these shrooms?"
Gregg-
"Defacately!!!"