got his Blue

Yes, it means that. Very likely, it refers to a blue ribbon, which is the first place award for field events, such as running, the high jump, the broad jump, etc. However, that is an American custom, and you might need to wait until and Englishman shows up to give you a correct response.

No Englishmen here yet, but I can confirm that to "get a blue" from your university college means you are selected to represent your college in your event, sport, etc. Rowing blue, soccer, rugby, athletics etc.

I think it was originally a blue cap or something, but the colour represents success. Probably a special necktie too.

There's a lot about this in Wikipedia.

An excerpt:

"The first sporting contest between the universities of Oxford and Cambridge was held on 4 June 1827, when a two-day cricket match at Lord's, organized by Charles Wordsworth, nephew of William, resulted in a draw. There is no record of any university "colours" being worn during the game.[1][2]

At the first Boat Race in 1829, the Oxford crew was dominated by students of Christ Church, whose college colours were dark blue. They wore white shirts with dark blue stripes, while Cambridge wore white with a pink or scarlet sash. At the second race, in 1836, a light blue ribbon was attached to the front of the Cambridge boat, probably as it was the colour of Eton. These colours — light blue for Cambridge, and dark blue for Oxford — became the official colours of the two boat clubs, and through the rivalry of the Boat Race, the colours became inextricably linked with the universities and contests between the two."

Thank you~