Cottage Cheesing is when you suck off an old guy and then spit the cum into a jar, let it harden, then chisel it out and smoke it. Then as your smoking it, it runs down your throat giving you a warm sensation throughout your entire body. It is called "cottage cheese" Because as it's settling in the jar it resembles cottage cheese.
Guy #1: Hey man, want to go cottage cheesing?
Guy #2: Sure I know where a bunch of old guys hang out, it's a great spot!