"Twin Size Mattress" is a song by the band The Front Bottoms, and it tells the story of a close friendship that is damaged and eventually destroyed by addiction. The song is among the most beloved Front Bottoms songs and has a deeper meaning that has been interpreted in different ways by fans and critics. Some interpretations suggest that the song is about a relationship between the singer and a toxic friend, one who is possibly dealing with addiction. Others suggest that the song is about two male friends, one of whom is a closet homosexual. The protagonist is singing about his friends who are struggling with their lives, and how he wants to help them through the tough times. The song is a poignant narrative of friendship, loss, and the struggles of growing up.