The ja meaning German for yes. When looking at the ja definition, you'll notice that the word is pronounced as though it begins with a "y" instead of a "j." While traveling in Germany and surrounding areas, it's common to hear ja in pubs and bars when people are asked if they want a refill or if they are asked if they want a beer when they enter. There is a strong accent on the first letter of the word. Ja is often said with enthusiasm whether it's as a response to a simple question or it's being used in general conversation.
‘Let's go swimming.’ ‘Ja!’
ja, this is the life!
Jamaica (international vehicle registration).