The phrase "a giant slice of" is correct and usable in written English.
It can be used when describing a large portion of something, often in a literal sense related to food or metaphorically to indicate a significant amount of something.
Example: "After a long day, I treated myself to a giant slice of chocolate cake."
Alternatives: "a huge piece of" or "a large portion of".
Eating a giant slice of pizza?
Some wore inflatable crowns while one man had a giant slice of Edam on his head.
A postmodern structure designed by Diller Scofidio + Renfro and Gensler, it looks, from a distance, like a giant slice of layer cake.
The Aouzou Strip — its name sounds like a turpentine-based cocktail drink, or a particularly painful bikini waxing method — is a giant slice of Sahara, named after a locality in its northwestern half.
The occasion was a giant slice of mom and apple pie served up to the nation today at the grand opening of the Norman Rockwell Museum, a $9.2 million complex on 36 acres overlooking the Housatonic River.
This was the backdrop to Berezovky's claim that Abramovich owed him several billion pounds as a result of a deal they brokered together to take over a giant slice of Russia's oil industry.
His hardy sign-off of "Let's go NY Yankees!" got the ballroom chanting,"Let's go Yankees!" Costume winners of the annual Hulaween Ball, judged by Kors, included half-a-dozen people as ginormous potted flowers and a group of dudes dressed as a stocked liquor cabinet--Jose Cuervo carried a sparkling giant slice of lime--very economically appropriate.
Then out came the pie chart, showing the giant slice of the budget consumed by Medicare, Social Security and Medicaid, untouched by lawmakers.
And they rarely do, because the giant slice of cheesecake they order will be 1,672 calories and then they'll leave this fancy dinner feeling all bad about themselves and their choices, and the fact that they can't stop, won't stop when it comes to stuffing down food at the dinner table.
Then they ran the mortgage apples through a giant slicer and selling buckets of the apple slices to other banks.
A dress with giant slices of tomatoes would have delighted the Surrealist painters.
