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1.
In project finance the "tail" is the period after a contract tenor ends but the asset retains useful life. A project that has a lot of residual value, either because of a short contract tenor or a valuable post contract environment, is said to have a long or large tail. A project with an extraordinary tail has a kangaroo tail.
That power project in Oman dude. The 15 year duration and fantastic peaking revenues post termination mean it's going to have a kangaroo tail! 60% residual value for shizzle.
by Jezza Silva October 06, 2009
 
2.
a streak of faeces left in a toilet after one takes a dump. variations include the reverse kanga.
dude, look at these kangaroo tails!
by icicle bob July 07, 2005