Roomer/ˈruːmər,ˈrʊmər/ Definition 1 of 2Pro Tip 1/3Cultural Context Understanding 'roomer' may imply knowledge of local housing practices and affordability issues. Many college students become roomers to save money. Pro Tip 2/3Personal Connection 'Roomer' often denotes a personal, often friendly, relationship with the house owner. Our roomer often joins us for dinner. Pro Tip 3/3Not a Guest A roomer is not a guest; they pay rent and usually stay longer. The roomer has his own key to the house.