PC has many definitions.
1. Pretty cute. An expression used by men or women to describe a person of the same or opposite sex that they find attractive.
2. Personal computer. This is the thing that you are reading this text on, I presume.
3. Political correctness. This is a type of modus operandi where the idea is not to offend anyone in speech i.e. not saying words such as "retard, nigger," or any other words that could be perceived as hateful.
4. Pre-calculus. This is an advanced high school and oftentimes required college class that introduces students to the world of calculus and its symbols and method of thought.
5. Can be the initials of a certain person, for example, Phoebe Conybeare or Phil Collins.
6. Pro-choice. This is a person's belief that it is a woman's right to have an abortion if she sees fit.
7. Player character. This is the avatar that a video gamer uses when playing an interactive video game.

Probable Cause

Short form of the famous German town "Picher City", also known as Picher. It is a commonly used abbreviation among locals in that region.

In role-playing games RPG, this is the "player character" or "playable character."
A player character being your personal controlled character, and playable character should be pretty obvious.

Politically Correct. A left wing plot, encouraged by the soft cock media, to ensure that people are persecuted if one calls a spade a spade. The idea is that no one's feelings are to be hurt and everyone is homogenous. You used to be able to say "Gee, you are a short cunt". Now you say nothing but if you really must say something, you must say "I am very sorry to notice that you are vertically challenged".

portable computer

Personal Computer. Despite its definition, PC's were originally computers with Intel processors. Most people think that PPC is synonymous with Windows, however, those people are idiot when it comes to computers. PC includes Windows, any variant of Linux (that is a lot of operating systems), BSD, Solaris, and all Unix-based operating systems. Macs are Unix based, so when people compare Macs to PCs, they are comparing the same thing. This is not because Macs are "Personal" (Windows is more common in workplaces now), but Macs match every other of today's definition of PC.

Poop Chin. When you have poop... on your chin.

a personal computer (only refers to Windows, not Macs)