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1.
Allowing natural selection to work its course, thus thinning out the population of those that can not survive on their own.
Criminal: 'gimme your f---ing money!!!11'

Victim: (pulls gun out) BANG!!!

The victim has helped thin the herd.
by No perpetual social safety net January 05, 2012
 
2.
The act of playing a song at a club, usually country, that discourages the African American race from remaining on the dance floor. This is due to their lack of interests in songs that don't have a defined "beat" that makes club type dancing possible.
"There are too many black guys on the dance floor, its time to thin the herd and play a country song."
by FSquared711 January 10, 2012