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It supposedly means "a word that rhymes with nothing" or "a word that rhymes with month".

Purple rhymes with curple (1.the hindquarters or the rump of a horse, a strap under the girth of a horse's saddle to stop the saddle from kicking forward
2.(transf.) the rump, the posterior) , and hirple (intransitive, Scottish, northern British) to walk with a limp, to drag a limb, to walk lamely; to move with a gait somewhere between walking and crawling.

Silver rhymes with Wilver (a nickname) and chilver (a ewe lamb).

Orange rhymes with Blorenge (a mountain in Wales) and sporange (a sac where spores are made).
Dunth- They do rhyme shithead.
by sexygeekface January 08, 2010
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2
a word for which there are no rhyming words
purple, orange, turquoise
Note: dunth undunthes month :-)
by Andrew May 01, 2003
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