2) File extension for ISO-9660 file system for transferring data to a CD.
3) Common term for any number of CD image formats, including .ISO (see definiton 2).
"Looking for all latest releases. ISOs only."
Person B: "No, I missed it. How was ISOS?"
Person A: "Pretty good if you know what I mean"
Person B: "I'm kidding, I did see ISOS perform"
2) A term for a really really hot chick. This is adapted from the 2010 film "TRON: Legacy" because Quorra, the last ISO played by Olivia Wilde, is so unbelievably hot.
Guy2: "Yeah, she's such an ISO."