A wannabe is gang gang guy that suffers from peer pressure and so he wants to get others to think more of him by adopting a "cool" lifestyle buying expensive clothing, flexing their souls, listening to gang gang rappers and trappers etc. Usually, they are basic 13-15 girls and boys. Although, the word "wannabe" is used as a harassment word for those who do that.
This guy is a big wannabe, he is wearing a supreme bomber jacket or something FFS.
Billeison is a term used to characterize a Greek guy that is based. It is often used in the greek city of Sparta, Greece known for many red-pilled warriors
Someone: wow m8 you are so smart. Isn't your name Billeison?
Billeison: Indeed, I am Billeison.