Looks like he’s thrown another sickie (=pretended to be sick and not gone to work).sickiesick‧ie /ˈsɪki/ noun [countable] informal 
Looks like he’s thrown another sickie (=pretended to be sick and not gone to work).2American English a sicko – used humorously
EXAMPLES FROM THE CORPUS
- She was not a loser, like Nina, or a sickie, like Amelia.
COLLOCATIONS FROM THE ENTRY Looks like he’s thrown another sickie (=pretended to be sick and not gone to work).
1 British English a day when you say that you are sick and do not go to work, even though you are not really sick: Looks like he’s thrown another sickie (=pretended to be sick and not gone to work). Looks like he’s thrown another sickie (=pretended to be sick and not gone to work).2American English a sicko – used humorously