Ted Alexandro has been railing on the writers from "Saturday Night Live" all day Sunday, claiming their now-viral skit -- which was all the rage Saturday -- is actually his own material ... which he performed live at the Comedy Cellar in none other than New York City.

He writes, "Dear @SNL, since you stole my Zillow joke last night please Venmo me the sum of 1 million dollars. My full special Cut/Up is on youtube if you need more ideas." Ted added a mash-up of his original joke and the 'SNL' parody, which have familiar themes and beats.

The gist of the gag is that the older you get, the more certain aspects of adulthood start to appeal to you -- maybe even in a sexual sense. 'SNL' played up the whole "yeah sex is great" angle ... and turned Zillow browsing into a softcore fantasy porn ad of sorts.

Ted's original performance of the Zillow phenomenon ain't all that different -- but he makes it more about how he and his wife "sext" each other ... sending each other Zillow listings that are out of their price range to make one another hot and bothered. They're both funny ... but Ted's insisting he did it first, and seems to want either money and/or credit.

It's unclear when Ted first performed his Zillow joke, but it appeared in a compilation video he released with a bunch of his stand-up shows called "Ted Alexandro: CUT/UP" ... which got posted on YouTube in September. Looks like it might have surfaced well before that though.