moustachy adjective2 •Having a moustache.As a class they are suspiciously well dressed, moustachy, coarse featured, fond of gay colored vests, dangling fob chains and big seals. — 1856 •Involving a moustache.Martin’s kisses were so hurried and moustachy and bristly—you couldn’t feel his lips, even—and unemotional. — 1923 formsmore moustachy · most moustachy