Kill time
A noun given to certain activites that mean little to the person performing them and in fact are just performed to waste time.
Example:
Donnie: "Why do you waste time on the computer writing definitions for made up words?"
Frank: "It's just a kill time to get out of working"
Donnie: "Why do you waste time on the computer writing definitions for made up words?"
Frank: "It's just a kill time to get out of working"