a coldness which is rather apparent in older school classrooms, or brisk mornings. refers to the words nippy, meaning cold, and noodles, meaning long stringy pasta (the connection is indeterminate).
Marie: "Boy, it's nippy noodles in here today"
Spencer: "why do you keep saying that?"
Marie: "shut up, Spencer, i'll say what i want!"
Marie: "i love you spencer, and i always have. i wish to spend my days with you, and press myself against your warm body."
Spencer: "I suddenly feel very hot... does anyone else feel that?"
Marie: "I'm still nippy noodles"
Spencer: "were you saying something?"