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a type of small freshwater polyp that is found near the surface and reproduces by budding.
At first I thought a hydra was a plant, but then I learned it was yet another creatre in the cnidrian(jellyfish) family.
Hydra by Light Joker May 16, 2004
The rare occurance of a penis with more then one head.
OMG WHATS WRONG WITH IT

What? Its just a hydra.
Hydra by Scotsburn July 27, 2009
A mythical creature usually with the likeness of a dragon. Has more than one or two heads.
There's the Hydra!

Bring out your broad sword!

SLICE HIS THROAT!

And grab his scrote.
Hydra by larstait October 28, 2003
My 200 hyrdas owned a billion firebat, 200 marines, 10 tanks, 49 ghosts, 72 goliaths and none died.
Hydra by Adeadlyliquid September 28, 2004
(Blue) Hydra, a form of cannabis that tastes like blueberry
They smoked some dank blue hydra the other day. It was delicious.
Hydra by J Bump July 23, 2008
When a girl's got three or more cocks in her mouth and they all blow at the same time. They then proceed to slap her in the back of the head making the jizz come out her nose. (variation of the Ice Dragon)
We gave her a sweet hydra last night...now she's dead...
hydra by Xalac November 2, 2006