no doubt about it; cempletely; totally; for sure; of course; naturally; in an expected way or order
can be used before, in middle, or at end of sentence, however you see fit.
1. 100% I wanna have sex with that girl!
2. someone says or does something you're excited and happy to hear: friend: I think we should go out tomorrow night You: '100% we will!"
3. hell yeah! 100%