he was the harsh irrational one who just hated the truth out of blindness. he was the first to make the people disperse when the Prophet pbuh first plucked up his courage and called them to the mount so he could warn them of their situation.
despite being his uncle, he would do everything he could to deride and undermine him, and he would even follow behind the pilgrims who would come to listen to the prophet pbuh, and tell them that the Prophet pbuh was demon possessed and a soothsayer and mad, and they would go away thinking "his own family know him better"
the word lahab is flame, the drunk part i don't know, but it may have been portrayed due to his blind, thoughtless character.