look up any word, like blumpkin:
 
1.
putting down
he was dissing on my mom when he called her fat
by kitty February 24, 2004
 
2.
Utterances of a (dis)respectful nature.
I was dissing Balazsr's on AOL for his/her lame comebacks.
by Bohemian Earth Mother April 12, 2005
 
3.
Term used by older, ass-hat salesmen in an attempt to seem younger and/or cooler than they really are. It should be noted that it rarely, if ever, works.
Salesguy: "I was dissing my buddy big-time for that whack sale he made."

Same Salesguy: "Did I use that properly? How did it sound?"
by Pudie February 19, 2010