This particular golfer is the one to whom Luster tries to sell the golf ball he claims to have "found" in the yard. When Luster gives him the ball to look at, the "white man" puts it in his own pocket and tells Luster to "find yourself another one" (53).
When in 1928 Benjy first moves to the gate in front of the Compson house, he refers to it as the place "where the girls passed with their booksatchels" (51). He may simply be remembering the girls who walked past over a decade ago, or more probably is referring to a new generation of girls who walk past his house in 1928. To him the girls, like the golfers with their "caddies," are part of the pattern by which he continually re-creates and tries to heal the pain associated with the loss so long ago of his "Caddy."
Like her mother Caddy, Miss Quentin is sexually active as a teenager (and also seems to be pregnant, as Caddy was with her, out of wedlock). Jason is sure that his niece makes herself available not only to all the "slick-headed jellybeans" (184) and "dam squirts" (188) in Jefferson but to "every dam drummer and cheap show [man] that comes to town" (239).