1. A small, quiet animal with pointy, protective quills on its back to keep it safe from predators.

2. A person, typically a gamer, who is overreacting or lashing out at someone who was not in any way involved in the situation which the "porcupine" is angry about. These people typically play Minecraft, CS:GO, Geometry Dash, or any sport-themed video games.

a small prickled animal who resembles that of a hedge hog. You are all dirty minded. It is an animal, don't ruin it for the rest of us. hmph.

When a man has used so much product in their hair that in retirement his hair is permanently spiked backwards giving off the appearance of a porcupine.

A woman that has really been around

comes from the phrase "if she had as many dicks on her as shes had in her she'd look like a porcupine"

The act of taking a live porcupine (also called the quill pig) and throwing it at an unsuspecting passerby. It is frequently used as a method of revenge on someone who has recently committed a grievous offense.

woodland creature with lots of needles sticking out of it.

When a girls pubic hair is extra sharp right after she shaves and it stabs your skin while fucking her.