Someone who is there for you through thick and thin, providing solid advice and guidance through lifes trials and tribulations.

A person having vast knowledge and expertise with an uncanny ability to share it with a you.
Drew: Damn, this situation sucks.
Daryl: Yeah I know but I dont know what to tell you. Thats rough.
Drew: I will call my life mentor, Shannon. She will be able to provide some perspective.
by Drew Schwartz February 2, 2009
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