@divegeester saidWhen new exchange students from overseas arrive at a university here they are assigned a "buddy" ~ a local student here in their third semester ~ who shows them around and answers questions on their first day. After that, they usually hardly ever run into each other again as they attend different lectures.
“Buddy” is also a diving term, as in “dive buddy” or “buddy up”
Your dive buddy could be someone you have never met before and may never meet again.