That story sounds/smells 'fishy' [='suspicious, dubious'] to me.
There's something 'fishy' about that guy.
a 'fishy' odor/taste
(..) Listen, Eddie. I've been thinking about our living situation. Why are you smiling? I got a little surprise. Look. There's a new fishy. I named him... ...Chandler, you know, after you. Well, that's not even a real fish. No, that's a Goldfish cracker. So what's your point, man? (..)1996 TvShow: Friends Title: The One Where Dr. Ramoray Dies Season: 2 Episode 18