This phrase is synonymous with "big hands" or "large hands". It just means you have big hands and/or long fingers (which are needed to reach around and play a bass well).
If someone tells you that you have bass player hands it means that either 1:They are just observant and noticed your big hands
or
2:They want your fingers inside them, and they're letting you know that they are thinking about your hands.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.