I think there are two meaning why Sascha said meat 1 is because of meat sounds the same as Nico in japanese and it was a short way to say nicoolo and the 2 one is that sasha once said that meat is like a heaven "freedom" so it's like she can feel the freedom finally....
Yushiro: *calls nezuko ugly* Some hashira, tanjiro, zenitzu, me and a part of the fandom: UGLY?! HOW DARE YOU?! Tamayo your assistant need some glasses-