O.H.B.
Short for Old Hateful Bastard. A title given to people who are mean, grumpy, and like to throw things at kids.
My grandpa is an O. H. B. He threw a spoon at me when I spilled soup on his pants.
My teacher called my dad an O. H. B. because he yelled at the class.
My brother said his friend was an O. H. B. because he stole his pizza.