A relationship where one person is the "user" and the other person is the "usee". Typical useries are disguised as friendships, marriages or business partnerships.
I thought I was married but it turned out I was in a usery
for all she wanted was a roof over her head and a charge card in her hand.
My business went under because I didn't realize I was in a usery
. My so-called partner took half the profits and did none of the work.