Something that is kinda cool, maybe, but when it really comes down to it, really isn't actually all that cool. Kind of like the sport baseball. It isn't that baseball is not cool, its just, their are cooler things than baseball. On a scale of 1 to 10, baseball cool falls somewhere in the 6 to 7 range. It's better than cool, but not awesome.
John: How cooooll is this Hawaiian shirt!
Frank: Hmmmm.. its pretty baseball cool
John: Baseball cool?
Frank: Yeah, its cool, but only as cool as Hawaiian shirts can be
Onlooker: Wow, that catch was so baseball cool
Onlooker2: you can't just relate all catches to baseball
Onlooker: Baseball cool, as in it was just decent