Along with anarchism, one of two ideologies that teenagers adopt in high school before growing older and smarter.

Someone who doesn't care about what you do as long is doesn't affect them.

Someone who is part of a broad spectrum of political ideology that advocates for less coercion, thinks that the governments power should be limited or abolished, and values consent. Right libertarians believe that a private and free market benefits and progresses society the most out of any other economic system. They also believe that corporations and monopolies are products of the state from mass regulation and taxation. The vast majority of right libertarians are not wealthy millionaires, by the way. The left libertarians believe that the people, should voluntarily own the means of production, whether that means everyone in a society should be part of a worker cooperative or everyone of a society owns the means and end results of production. Markets are not exclusive to capitalism too, look at market socialism. Both sides are actively against government oppression (both oppression against anyone in and out of the country) and corporations and are for liberty and consent. Both sides believe that consent is very valuable, if you consent to something, the government shouldn't be allowed to restrict you from doing it. Both sides also believe in the legalization of all victimless crimes. A victimless crime is a crime that doesn't actually violate anyone's rights or a crime that is actually a consensual action.

Here is what a libertarian is not: a pedophile, an advocate of slavery, a neofeudalist, an authoritarian, a republican/conservative, a democrat/liberal, or a bootlicker.

Someone who believes in individual liberty as a political principle. Libertarians want a small government that focuses on protecting individual rights and little else. They believe the government should have no role in social matters (gay marriage, for example) and business matters (regulations on businesses such as licensing and minimum wage laws). They want fewer wars and less political corruption, and a greatly reduced welfare state. They believe that this arrangement is both moral (because individual rights are paramount) and practical (because free markets lead to more diversity and wealth).

The only people in this country with common sense.

The Libertarian platform is this-
"We hold that all individuals have the right to exercise sole dominion over their own lives, and have the right to live in whatever manner they choose, so long as they do not forcibly interfere with the equal right of others to live in whatever manner they choose."
That means that abortion, gay marriage, gun rights, property rights, etc., etc. would not be regulated or prohibited. Robbery, murder, vandalism, arson, etc. would still be punishable by law.

A person who greatly desires to win an argument that nobody else wants to have.

An individual who applies logic and common sense regarding political and economic policies. In the negative, the typical individual in the absence of state influenced indoctrination.