One would assume it wasn't added to the W-2 form if a form 1099-Misc was issued. Furthermore, if it was associated with your job, it is probably compensation in some form or other. So, to be technical, if it was not reported on your W-2, but is compensation, the next best way to report it would be as self-employment income.
To do so, you would have to answer the business related questions, as they are necessary to have the business schedule C completed properly.
Also, if the amount is nominal, you're probably not going to get into trouble doing as @CollenD3 suggested.
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