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1.
When a person expresses themselves and another, over rules what they are saying. This shows their lack of sympathy and empathy towards anyone but themselves. They are degrading the first person as if what they are saying is pointless. As shown in the example, the second person does not care for the first persons opinion, but only want to reflect their own achievements, by Black-cating others.
by Ashlee =] May 15, 2008
 
2.
To always try to trump someone else in a conversation.
An example of black-catting is "I have a black cat."
"Yeah, well my black cat is blacker than yours."
by Shackleford Hurtmore May 25, 2012