The word Hadacall is a comic generic term meaning too lazy to come up with a better name. When asked what the song "Hadacall Blues" was named for, Jerry Lee Lewis sang "we hadacall it something!"
A cute guy who is talented in many fields, also known as a "Based God Jr." You're very lucky if you ever get to meet a person like that, because they are very rare. They are almost extinct like pandas, so you have to protect them.