I was unacquainted with the term but after searching it seems that Eliezer Yudkowsky wrote several posts on a BDSM website where he fantasized about recruiting a harem of highly educated women to service him which he called "math pets".

>...recruiting a harem of highly educated women to service him which he called "math pets".

Dammit, now I have a new fetish.

Someone that you introduce to free group actions and the Cox-Zucker machine, hairy ball theorems, stuff like that

Have you seen it come up with bott periodicity and the onto ele in twister space?