Top Definition
The colloquial name for a Nellis' dick. The Nelliphant is similar to its animal namesake in several aspects: it needs to be fed regularly, it becomes stiff when excited, and it sounds a distinctive call when threatened or in need of a mate.
Nellis: Man, tonight is my chance to score! I've laid SO many foundations with ladies! I told this one girl I thought she was cool, she's totally into me.

Matt: Let's not get carried away, Nellis; the Nelliphant hasn't gotten out of its cage all year...
by YouGotGotNellis November 26, 2011

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