What is a pre poo?

in Hair Type 4
I've heard that it is basically putting condish on your hair before you shamoo, and i've tried it, but I don not really know how or what it does for you. If anyone does pre poo treatmnts, please share how you do them and the results you get.
Super Thick corkscrews and waves. LOVE Elucence MBC, Giovanni 50/50 condish, Qhemet Products, V05 Calming Chamomile Tea Therapy condish, Jessicurl WDT. These are my official HG's that I love oh so much
http://www.youtube.com/user/Curlypad?feature=mhum

http://www.youtube.com/user/Curlypad?feature=mhum

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I use either Ojon Restorative Hair Treatment, Anita Grant Rhassoul conditioner+ coconut milk, or a homemade concoction. Whatever I do it goes on dry dirty hair.
Ojon (it's an oil) -- overnight
Rhassoul - saturate my hair, put on a plastic cap and micro heat cap for 1/2 hour. Same with homemade. Lots of good recipes but this one works for me -- measures are very estimated--
Coconut milk - 4-6 oz
conditioner - 2-4 oz
Honey 1-2 oz
coconut oil 1/2 - 1 oz
castor oil (or any fixed oil of choice) 1/2 oz
A few drops of essential oil
My FOTKI - http://whatsnew.fotki.com/suburbanbushbabe/
Playing with my hair is a hobby. Fluffy, fine natural 4a. Goal= Healthy, beautiful hair that retains its length.
http://www.youtube.com/user/Curlypad?feature=mhum
4something-ish