When a girl wants to finger herself, but is wearing tampon, so she can only get her finger in a little bit, resulting in what looks like a battery that has twenty percent left

When something is so cool or good that it is 100%.

One percenter can sometimes mean the one percent of the population that takes up new technology first.
People who line up for days to buy the latest iPhone before everyone else gets it are one percenters, not because they are the one percent richest or the one percent most intelligent but because they have a constant need to feel special or exclusive.

It really can be anyone who has a mind not very commonplace at all. It can be groups of people who have an opinion so very rarely uttered, a group with IQs exceeding average levels, the rich folk who have enough wealth to influence our country, people who say words that the majority won't even understand or don't make any sort of sense, or even people who simply just have a mind of their own.

While granted this is not necessarily a bad thing all the time, it can be if you happen to be unintelligible, or just plain uncharismatic in general.

the percent of the U.S. population that is jewish