How 'nifty' relates to saving energy

Goya : The Sleep of Reason Produces Monsters

We are IT engineers not linguists, but in terms of human languages between the two of us in the IT team we have a command a command of english, german, dutch, norwegian, french and spanish. 

Being able to communicate effectively is essential for IT staff. They should be encouraged to blog !

We have a thing called DSLs - Domain Specific Languages (so DSL is basically geek jargon for jargon).  

A nifty DSL is apt -and well suited to the task being just as terse and / or expressive as it needs to be - but where does the word "nifty" come from ? ...