The term 'SIX-PACK MAKEUP' refers to a type of makeup that is designed to give the appearance of having a six-pack. This type of makeup is often used by bodybuilders and fitness models to enhance their physique and create a more defined look. The crossword solution for this term is ABS, which stands for abdominal muscles. ABS makeup is designed to give the illusion of having a toned and defined midsection.