Superlative form of chunky: most chunky.(adjective)
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Use "chunkiest" in a sentence
"But at a bit over two-thirds of an inch thick, the Echo will be among the chunkiest phones on the market."
"He brings the necklace out from under the T-shirt to reveal the most dazzling, chunkiest, blingiest gold and diamond Jesus you could ever hope to see."
"Naturally, then, I was particularly enjoying watching the Amgen Tour of California on Versus yesterday evening, as the stage took the riders along the chunkiest, most succulent section of the burrito from San Francisco to Santa Cruz."