I think they're referring to cold cuts. From wikipedia:
Most pre-sliced lunch meats are higher in fat, nitrates, and sodium than those that are sliced to order, as a larger exposed surface requires stronger preservatives.[1] As a result, processed meats may significantly contribute to incidence of heart disease and diabetes, even more so than red meat.[3]
A prospective study following 448,568 people across Europe, showed a positive association between processed meat consumption and mortality caused by cardiovascular disease and cancer.[4] Similarly, a prospective study in the US following half a million people flagged a similar association between death and increased processed meat consumption.[5] The World Cancer Research Fund International guidelines on cancer prevention recommend avoiding all processed meats.[6]