Old Danny Boy is some one who at a young age aspires to be a wise old man. Everyone has a Danny Boy in their life. He will most likely be a registered sex offender for intimate relations with a young girl. When Danny Boy is ever called out on his bullshit or outsmarted, he responds with an irrelevant and absurd statement.
Friend: Danny Boy have you ever driven a truck.
Danny Boy: Yeah I have! Ive driven an f250 Cummings.
Friend: Danny Boy Ford does not use Cummings engines.
Danny Boy: You want me to rip the foreskin off your dick and feed it to you.
(Danny Boy at a bar)
Danny Boy: Bartender, Ill have a scotch.
Bartender: You're not having anything, you are clearly not 21.
Danny Boy: I'm going to bend you over and take you down to brown town.
Bartender: Excuse me.
Danny Boy: you heard me right, brown town. You don't give a man a prostate exam without using butter.