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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.
Definition 1 sentence: "I was poked in the hand from a porcupine I brainlessly attempted to snuggle with."

Definition 2 sentence: "Dude, quit being such a porcupine over Minecraft."
Porcupine by EliteArchwing February 12, 2017
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"
damn dude u fucked mary too so did greg ,john, curtis, and about 15 other guys before them

yea that bitch is a porcupine for sure
porcupine by Masta Dragon Red June 18, 2007
woodland creature with lots of needles sticking out of it.
if she had as many things sticking out of her that she has stuck in her she would look like a porcupine.
porcupine by deadman77 April 27, 2010
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.
porcupine by jmitch77 August 12, 2009
Noun: pour-q-pine
A female who has had many sexual partners and is known for her promiscuity. This term is derived from the idea that if the female in question had as many cocks growing out of her body as had been in her body she would have the appearance of a porcupine.
Ex: (Two Friend having conversation)

"Hey man did you see anabelle in first period, she's got a great ass."

"Yeah, but I wouldn't hit it, I hear she's a mayjor porcupine!"
Porcupine by joecamel April 1, 2009
When a girls pubic hair is extra sharp right after she shaves and it stabs your skin while fucking her.
"She gave me a Porcupine and it hurt the whole entire time."
Porcupine by PaPa ZiTT November 30, 2006