Orphan's Flour

Okay, listen up, you knucklehead. You posted a joke, and it's my job to explain it because you're clearly not that bright. First off, "self-raising" is a type of flour that has the baking powder already mixed in. The humor comes from the fact that "raising" also means growing up, and orphans are kids without parents, so they're essentially trying to "raise themselves". It's a pun, get it? So, because orphans don't have parents to raise them, they use "self-raising" flour. Get it now, dummy?