Composed of the shells of dead marine creatures(adjective)
Resembling, or comprising, the shell of a mollusc(adjective)
Abounding with shells.(adjective)
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Use "shelly" in a sentence
"March 21st, 2010 at 6: 16 pm tombaker says: crazy shelly is “pro-stitute”. and her johns are all creepy, icky old dudes. eeeeewwwwwwww."
"At the hospital, she did write down the word "shelly" and when asked if she meant Sheckles, she shook her head yes."
"The fossils, which were described as "shelly" and are believed to have bellowed to primitive sponge-like creatures that dwelled in ocean reefs, were unearthed below 635 million year old South Australian glacial deposits."