Sentence:  The amazing Mr. Sick Day [Milo Filbum] has missed an amazing 73% of 1,020 work days for such ailments as a toothache, [...] "I finally gave the <WSD>sicko</WSD> his walking papers when other people started doing the same thing — calling in sick and all," the manager [said] ... 
Meaning of the word marked with <WSD> tags:  A physically ill person.