Knowing that something is not right, that something's wrong. Also, to have a bad feeling in your gut about a certain person, place or thing.
She knew as soon as she walked into the bedroom something fishery was going on.
The young boy thought to himself, "I knew something fishery was going on in here" as he unknowingly entered an all-men's Gym.
1. The act of fishing
1. Son, have you been engaging in any acts of fishery? I found a long rod and tackle in your room.