I suspect someone’s not doing a very good job of distinguishing “cool” from “cool!”
The former is:
“Sorry I’m late, the bus took forever.”
“S’cool, no worries.”
or
“Check out this new Google search where you can upload a picture and it’ll find ones that look like it!”
“Oh, cool.”
The latter is an affirmation of hip or stylish status:
“That jacket is awesome, where’d you get it?”
“Bought it in Japan over the summer.”
“That’s fuckin’ cool!”
or
“Check out this bootleg vinyl — a demo session with Mike Patton and Eugene Chadbourne.”
“Oh, cool!”
