A slugger is a boxer wins a large amount of their matches by KO. In Baseball a slugger is a hitter who hits a lot of homeruns.
In baseball slang, someone who is good at batting, especially in hitting home runs.
hit
Slug=Limax
I assume you mean "A" sea slug. No, a sea slug is not a fish, but an echidnoderm.
If you mean PROTIST, then no.
Slug could be a snail like animal. It could also mean one heavy bullet.
A slug is a mollusk like a snail, if you mean a slug like from a shotgun about length of shell, slug can also be slang for bullets which can be literally any size up to max.
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slowbucks
A blowout
To move or act slowly - as a snail or slug does.
Swallow shot slug
rifle slug regular slug
-- cannonball -- rifle slug -- javelin -- baseball -- Volkswagen leaving a trebuchet