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1.
An unspecified sex act between animals as described in the Geneis story re-visited on Fark.com.
"...the rhinocerous and the elephant gave the hippo a trunk job..."
by Nathaniel Taggart March 27, 2008
 
2.
A trunk job is the act of putting someone in the trunk of a car after you've killed him/her or before you decide to kill or dispose of him /her.
Take that fucking scumbag, no good rat, and trunk job him.
by Tattootony911 August 17, 2011