Shredder

[Justin Bieber]

The Ninja Turtles coolest arch-nemesis, and leader of the Foot Clan.

[Cami]

Someone who kicks ass at metal guitar.

[Tanya Shivari]

*Real name Oroku Saki, he is the Ninja Turtles arch-nemesis. Generally described as a man wearing Japanese-esque armor with blades on the wrist-plates, shoulder-plates, shin-plates, and the symbol claw-like blade across his cranium.

[Magaret]

Used seriously: A freak, one who was born defective.
Used jokingly: One who is very strange, unattractive, uncouth, and/or trashy, which could possibly be ascribed to birth defects.
Taken from the novel The Handmaids Tale by Margaret Atwood, where a shredder is one who is the defective product of radiation altered reproductive cells.

[Tina]

A shredder is a snowboarder.

[Donald Trump]

The Teenage Mutant Ninja Turtles arch nemesis.

[Dave Paprocki]

A female with braces that performs [oral sex] on a male.

[Kai]

A person who is performs well in most things he does and is applauded by his peers as a cool or popular person

[Little_Girl]

A good snowboarder from the 80s!!!

[Mark Zuckerberg]

A machine or other device for shredding something.