noun, masculineplural: roudoudous
candy consisting of hard caramel set in a small container, usually a plastic or real seashell
“Marie-Jeanne lèche son roudoudou avec délectation.” — Marie-Jeanne is licking her roudoudou with relish.
Possibly from doux. The original sense (end of 19th century) was 'sex'; compare ternary construction with zigouigoui, ragnagnas, radadas, riquiqui.