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1.
Metapod, a dud pokemon. This pokemon just sits there and all he can do is harden. This pokemon defies the laws of physics to stand up considering its crescent shape.
You have just caught a Metapod.
Metapod was tossed away. (Set "Free")
by Legs You Legend October 28, 2009
 
2.
(1) A Pokemon that cannot learn any moves besides Harden, and tackle if you've evolved it from a Caterpie. Will evolve to Butterfree at lvl. 10

(2) A useless person who rarely moves outside his house, likes to stay in and his head is impenetrable to matters outside his computer.

(3) A "has-been." Used to go around doing physical activities, but now stays immobile and lazy. May one day become fit again.
ex.1 "Dammit Joe you're like some kind of Metapod nowadays.

ex.2 The celebrity is now a Metapod, but hopes to one day be a Butterfree.

ex.3 "You're more useless than the time my Caterpie evolved to a Metapod!"
by Vincenzul October 02, 2007
 
3.
When your penis gets so hard that it doesn't move.
Before i fucked Jaine my dick pulled a Metapod.
by Roc18 April 21, 2010
 
4.
A group of desks or people who are in a pod-like shape (such as a triangle, circle, or square).
The students pushed their desks into a metapod.
by A Wolf Among The Sheep May 16, 2011