extension course
a course which is taken on the pretense of expanding one's knowledge and for the purpose of naming the institution on your resume. normally paid for by your boss.
"so are we on for golfing thursday at 3 p.m.?"
"I can't, I'm working..."
"you should've signed up for the extension course..."
"I can't, I'm working..."
"you should've signed up for the extension course..."