Thursday Morning Riddle

I’m a mollusk, like snails, but a shell I have not;
I am slang for a bullet just after it’s shot;
I’m a counterfeit coin used for tricking a slot;
And to punch in the face when the tension grows hot.

Who am I?

UPDATE: Riddle solved by Bronx Richie. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Bronx Richie Says:

    slug

  2. Bill Says:

    SLUG is correct. Way to go, Bronx Richie!

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