Originally from the comedy sketch show 'The Kids in the Hall', "subtastic" conveyed the idea that the speaker was about to say 'substandard', but quickly changed his mind to 'fantastic' after smelling the wonderful aroma conveyed by the subject of the conversation.
"I've called you into my office to talk about your poor performance at work. Frankly, your work has been sub... quickly changes his mind ...tastic!"
This is a term mostly used by those involved with Wheel of Fortune. It means fantastic, but the "fan" is changed to "spin", referencing the wheel in the popular game show. Pat Sajak, the host, has said this phrase a few times, which is how it stuck with the audience.
A word used by people who listen to Ska. One of the greatestcompliments you can give. Can also be used as an adjective meaning "amazingly kool in the ska world" See also: Skalicious