>tfw you talk to someone who knows a lot about music and you get embarrassed because of all the vocab you can't pick up on
>talk to someone who listens to a lot of music
>they ask what a time signature is
>they can't understand it when you try to explain it
People who know a lot about a subject typically know they know a lot about that subject, and often enjoy opportunities to show off their knowledge. Next time just ask him what things mean and he'll probably tell you and enjoy your company a bit more for having done so.