Script Kids & Silver-Screeners
One such is 'script kid', computer hackers' slang for an inexperienced or incompetent hacker - presumably one who relies upon running scripts written by other hackers rather than originating his own. It has pleasing layers of nuance from script girl to knowledge boy via slip kid.
The other's one that I invented myself the other day. I'm involved with a local film club, many of whose core members are, shall we say, genteel ladies & gentlemen of a certain age. Silver-screeners, which popped spontaneously into an email last week, seems the perfect way to characterise this demographic - retired persons with the means & leisure to spend a lot of time watching movies . . .