Here's what CNBC's "Fast Money" traders had to say about some of the market's biggest movers on their "Pops and Drops" segment Tuesday.

Pops

NutriSystem ( NTRI) popped 24%. Guy Adami said there was a lot of short interest in the stock.

Chattem ( CHTT) was up 4%. Adami said the company voluntarily recalled its Icy Hot patch. The stock got obliterated on the news, he said. The stock has room on the upside, he said.

Visa ( V) jumped 5%. Jeff Macke said to buy MasterCard ( MA) and sell Visa.

Drops

First Marblehead ( FMD) plummeted 37%. Karen Finerman said that the guarantor of the company's student loans filed for bankruptcy. Stay away, she said.

The iShares FTSE Xinhua China 25 Index ETF ( FXI) lost 3%. Pete Najarian said the stock has had a big run. He said Tim Seymour expects more pullbacks.

Garmin ( GRMN) slipped 8%. Jeff Macke said he loves the devices, but to sell the stock.

Flowserve ( FLS) was down 5%. Finerman said the stock was up the same amount yesterday. She said it may be approaching its price target on a valuation basis.

Agria ( GRO) fell 38%. Najarian said the company is involved in corn as well as sheep embryos. The COO has to resign, he said. He counseled against trying to bottom-pick in this stock.

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