usually when u add ussy at the end of a a thing/person's name it refers to the holethe thing/person might have. Here modussy means modi my beloved's pussy.
Flop1: Hey, have you heard of the new 1.53.x leak for Minecraft?
Flop2: Yeah, the Modussy leak! They added CupcakKe and Jiafei into the game and made it very aesthetic Flop1: That will drive daboyz away for sure!