a lot of something
OR
something heavy
"my teacher gave us a nifty assignment"
In Australia especially in Melbourne City when someone has a fifty dollar note. Or you want to make a quick fifty, that is a "nifty fifty".
Can describe anything groovy/cool, but these days usually refers to musical talent.
She has a nifty singing voice, and those nifty digits can sure play the keys!
A Reddit enlightenment that celebrates boobs of all shapes and sizes.
I have no problem writing “nifty tits” on my boobs and posting them to r/NiftyTits so that I can feel empowered and uplifted!