A person or person(s) who come to stay with you for a week or so and never end up leaving. Refuse to leave. Who don’t pay rent or bills. Who take up space and use electricity all day. Usually only leave by force.
Susan won’t leave Ana’s house, she’s become a squadder. She’s acting real squaddery. She doesn’t work or pay any bills and refuses to leave. Susan and her family are sqadders!