Senses
哥哥 older brother
one's elder brother; any older male relative of the same generation such as a cousin; a respectful way of addressing a male of the same generation who is slightly older than oneself
哥哥 father
term used to refer to one's father in certain historical contexts such as during the Tang dynasty
哥哥 final particle
(Archaic) sentence-final particle used in certain Yuan and Ming dynasty folk songs or sayings