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An unexpected erection resulting from the insertion of a plastic tube (or, in the case of The Cider House Rules, a bamboo shoot) into the urethra, aka "pee hole."
Nurse: This may feel a bit uncomfortable going in.

(A moment of silence passes.)

Fellow: I have an erection.

Nurse: Oh, yes, catheterwood. That happens sometimes.

Fellow: I feel...proud.

Nurse: I can tell. At least you don't have any accessory catheternips.
by moleawack November 06, 2009
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