Okay, A step dad or step father is someone who is a asshole or jerkoff they think once they move in after the real dad is gone, they have all the say so around the house. They make you do pathetic chores around the house they claim to own. They often yell and cut you down or cut your real father down so they look better. Personally, I think they suck and need to get they're head kicked in.
billy: "you suck so much..my dad is so much better then you"
step dad bill: "billy, go mow the lawn and when you finish that, you need to chop wood for the stove! i call the shots around here buster!"