1. A clump of chewing tobacco inserted into the lip.
2. The most kick ass form of the word Dip.
3. A delicious and highly addictive substance.
1. When combined with "poop": poop and a doop (or vice versa), it becomes the act of crapping while having chewing tobacco in your lip and is totally awesome.
Russ: Damn that's a big ass doop.
Ryan: Fo sho! You wanna take a fat doop?
Russ: Hell yeah. I'm gonna take a doop and a poop!