The word "fishy" is an adjective that has a couple of meanings, both of which can be understood quite easily.
Suspicious or Not Right: When something seems strange or not quite correct, we can say it is "fishy." It suggests that there might be something wrong or that we should be careful.
Related to Fish: It can also mean something that smells or looks like fish.
"Something smells fishy": This idiom means that something seems suspicious or not right.
There aren’t many common phrasal verbs that use "fishy," but it is often used in phrases or idioms as shown.
In summary, "fishy" is a versatile word that can describe both suspicious situations and things related to fish.