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1.

Disrespectful of sacred things: expressing or involving disrespect for God or sacred things.

Basicly it's just offending people by saying things about their regilious beliefs.

What he said was blasphemous; he said that Jesus was a lying fraud.
by Jafje June 06, 2007
 
2.
offensive toward anyone's particular religion or beliefs.
The thought of Moose eating a double ham and pepperoni pizza with a side of porkribs and a pig cola is very blasphemous.
by OrrFace Killa May 25, 2005
 
3.
Not relative, irrelevant.
Saying "rape" would be blasphemous to this definition...
by Adeadlyliquid November 13, 2004