The process of taking a live gerbil and shoving it up one's rectum for the purpose of erotic stimulation. Historically this is achieved through the use of a toilet paper tube. Sadly, the gerbil does not typically survive the process.
I once heard that Richard Geere was caught Gerbil Packing with a prostitute in some hotel room.
by Bill Gates May 23, 2003
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A derogatory term to describe a homosexual male.

Fudge packing refers to the act of anal sex.

Gerbilling is an odd practice of inserting a small rodent (mouse, often) into a condom which is then inserted into the anal cavity, where the dying convulsions of the poor animal are said to produce a pleasurable effect.

The term is derived from a combination of the two practices.
As heard on the train platform: "Get outta the way, you fudge packing gerbiller!"
by cosmicblue December 10, 2009
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