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Generally a person or persons' who enjoys the cats rectal area. A cat bummer is often associated with anal cat related activities. Basically some one who enjoys ass fucking cats.
On Friday nights Tom has often indulged in a good session of cat bumming.

Tom is a cat bummer.
by Daz183 October 16, 2008
one who indulges in the act of buggering cats.
tom is a cat bummer. on fridays him and several friends enjoy a good night in buggering cats.
by Daz183 January 26, 2009