Nama Article 24th June 2012
Srimad Bhagavatham 6:2:14
साङ्केत्यं पारिहास्यं वा स्तोभं हेलनम् एव वा ।
वैकुण्ठ-नाम-ग्रहणम् अशेषाघ-हरं विदुः ॥
Even if you are calling someone else, or you are just uttering the name for teasing someone, or you are uttering it without any meaning, or even out of derision - if you utter the Divine Name of the Lord, it will eliminate all your sins without leaving any residue.
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji