Yes, language changes, but if we have two words with different meanings, we shouldn’t combine those meanings.  Doing so makes shit confusing. So…

Uninterested adjective, not giving a shit, indifferent

Proper usage:

Pimp: I like it when prostitutes from my stable of prostitutes wear gold teeth, blonde wigs, and high-heeled shoes with fish that swim around in the heels. Should one of my prostitutes fail to wear all three of these wardrobe components, she will be met with stern harangues.  As for the rest of their outfits, I am utterly uninterested.  They can wear whatever outerwear they prefer.

Disinterested adjective, impartial, not taking sides

Proper usage:

We decided to have a robot adjudicate our marital disagreements because we wanted to have a disinterested judge.  Little did I know that my wife had been fucking that robot for 6 months.

HIGHFIVEBITCH