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).

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

a word for which there are no rhyming words

A phenomenon that occurs when all of the waste in one’s body comes out in one big burst or bubble, which can cause severe damage to surrounding structures or nature.