Lyric discussion by Poterpoter 

Cover art for Terminal lyrics by Rupert Holmes

The song is about AIDS. But by that time they have no knowledge yet about the disease. He got the disease from the woman he met on the terminal. They check-in to a motel and made love , although he was married and have kids. Its a betrayal and punishment. The song says “and you know it grows!. And he’s like a living dead. Its such a sad song.