A person who behaves in a selfish, self centred, lazy or miserly way; a killjoy
Can be strengthened by adding fucking
as an adjective: "miserable fucking bastard".
"I asked him to lend me 20 dollars and he told me to fuck off! The miserable bastard!"
"Let's go to the party!"
"I can't be bothered. I want to stay at home and read a book."
"You miserable bastard."