chairwarmer

slang

1. :  one who habitually lounges in a chair :  loafer: a :  a person (as one not registered as a guest) who sits for prolonged periods in hotel lobbies b :  an employee (as one in a sedentary occupation) who is superfluous or who makes little effort to apply himself to his work the seniority rule … discourages ability and efficiency, and encourages the chairwarmer — S. T. Williamson and Herbert Harris