We have lingered in the chambers of the sea
By sea-girls wreathed with seaweed red and brown
from T.S. Eliot – The Love Song Of J. Alfred Prufrock on Rap Genius
Meaning

The “we” is again the “you and I” of the first line of the poem: the divided halves of Prufrock’s own psyche, or maybe Prufrock and the reader who identifies with him.
To help improve the meaning of these lyrics, visit "The Love Song Of J. Alfred Prufrock" by T.S. Eliot and leave a comment on the lyrics box