Mariners tribal, Poseidon, I'm wavy
A reference to the Seattle (where Nacho is from) professional baseball team Mariners. Whose team name is reference to the marine-culture in Seattle.
Another Greek God reference, this time to Poseidon the god of the sea, earthquakes, storm and horses.
Going with the sea theme of the line, Nacho is wavy which is a slang term for cool, great, etc.
To help improve the meaning of these lyrics, visit "I'm a Greek God" by Nacho Picasso Lyrics and leave a comment on the lyrics box