The phrase "all that cool" is correct and usable in written English.
It can be used informally to express that something is impressive or noteworthy, often in a casual context.
Example: "I thought the new game was all that cool, especially with its graphics and storyline."
Alternatives: "really cool" or "quite impressive".
We never asked to become part of the Britpop club – all that Cool Britannia shit: Noel Gallagher shaking hands with Tony Blair.
Get another guitarist and do your thing.' I just didn't want to be around for all that cool pseudo … They were shocked.
As people in and around New York City prepare to rev up their air-conditioners, the electricity industry says there will be enough power to keep all that cool air pumping all summer.
I was still in elementary school, or possibly early junior high school, when all that cool stuff was goin' down!" Some of the people I said that to looked at me with scorn, and others looked at me with pity, but none of them looked at me with suspicion.
You may have downloaded that Cuban-Chinese rock band from the Morpheus site without paying, but the only way to get all that cool meta-information about each track, which lets you search for chords and lyrics, is to establish a relationship with the band by paying.
VendScreen may not seem all that cool against flashy hardware products like smart watches or drones.
Beneath all that cooler-than-thou championing of the obscure, Kurt Cobain also deeply loved popular culture – trashy, sometimes conservative and often tragically unhip.
THERE is also the old Washington-just-isn't-all-that-cool problem.
For me, Michael J. Fox represented all that was cool and exciting about science and invention.
The naivety and absurdity sit uncomfortably with all that super-cool violence.
After all that driving, a cool pool and room service were very welcome.
