"
Alt-Right"
I've heard it for a year or two, but have heard it a lot more since Trump named Steve Bannon (along with Reinz Priebus) as his co-chief of staff. Bannon is demonized by the Left as a racist associated with the KKK and so forth, and I really don't see any evidence of that.
The worst allegation is that Bannon on the Breitbart.com site he runs has used some tittilating and arguably racist/sexist headlines. Ridiculous. The idea is to use a headline that draws attention and gets clicks, right?
The liberal media uses this term to slanderously imply that anyone in this broad ambiguously defined movement is racist/dangerous/white supremacist, a KKK member or sympathizer, or otherwise right wing militant crazy.
That same liberal media, of course, ignores the ACTUAL Left wing militant craziness that is killing cops, threatening people and destroying property, while the Right (even if they were these KKK-like things, which I seriously doubt) are threatening no one.