[TOMT] [book] [2010s] a comedic novel I picked up and red the first few pages of in a bookstore a while back, circa 2014-2017

It was a very absurd, urban sci-fi comedy thing from what I recall, sort of Hitch-Hikers Guide to the Galaxy-esque. It began with a woman, who I think was a young adult living on her own, trying to grab her escaped cat off the roof. I think at night in the snow or something? Then parallel to this the book describes some weird serial killer guy (again, it was a comedy tho, so nothing too serious or scary) with like a mechanically-enhanced jaw that called himself the “hyena” as a nickname, I think? He was sort of stupid and just looking for infamy, I think videoing himself to go viral. Then the lady gets rescued by a third character telling her to watch out for the hyena guy, and they have some comedic banter about hyenas, and the meaning of the nickname…that’s all I remember. Very strange I know, but I’m curious what that was. Maybe it’s really famous and I’m just totally out of the loop, not sure.