A Tube Stretcher is when a couple puts super glue in the vagina and Inserts the penis then walk away from each other pulling the Penis to its maximum length.
A fool, some one who is being used by others and still do things for them. They like do things for people who use them. 'Someone' typically referring to teenagers.
They being called a tube refers to them being like a personal slave
"Go do thisfor me"
"Carry my things for me"
""He's like her tube, carrying all her things"