Just a soccer joke to dwfgator.
She is wearing a Manchester United jersey (one of the major soccer franchises in England), and I am a fan of their major rival, Liverpool Football Club. A sort of local hate relationships as between the Red Sox and the Yankees just a lot more intense :)
Hence he mentioned Usain Bolt, who reportedly has shunned offers from the NFL because as a Manchester United fan he wants to try out for them. :)