It's in BatBrain.ash line 1170:
case 3025: switch (equipped_item($slot[weapon])) { // utensil twist
case $item[hand that rocks the ladle]: fields.dmg += "0.2*buffedmys|55 hot,cold,spooky,sleaze,stench"; break;
case $item[Dinsey's pizza cutter]: fields.dmg...