funny money
If it were a Hink-Pink, it could be "a thick brick." Actually, the question is about Hink-Pink according to the original source for the question which is a book for gifted students. The section of the book asks about both hink pink and hinky pinky, and the question is in the hink-pink category on the page.
His quiz is the answer to hinky pinky boy's test.
Some fakes are very poor and others are excellent and if you have doubt about a coin show it to a dealer or collector for an opinion.
The one sure way to determine if a coin is real or fake is by weight. A genuine coin will have a specific weight, while a counterfeit will be too heavy or too light.
Hinky Pinky riddles are answered by rhyming phrases consisting of two-syllable words.
caffeine machine
caffeine machine
caffeine machine
A reader leader.
caffeine machine
caffeine machine
jolly polly
blubber scrubber
fig jig
rad pad
shrewd dude
pup cup