Good morning, neo. Bo was being facetious, but actually, iambic pentameter is just one method of measuring the rhythm of a poem.
Here is a link:
http://www.abwag.com/iambic_pentameter.htm
Let's assume there are folks out there who can't sense the rhythm of a poem, such as a limerick.
Example of a limerick:
There once was a lady from niger,
Who smiled as she rode on a tiger
They returned from the ride,
With the lady inside,
And the smile on the face of a tiger.
To get the rhythm of the poem, you must think, stressed and unstressed:
There ONCE was a LAdy from NIger.
Who SMILED as she RODE on a TIger
They reTURNED from the RIDE
With the LAdy inSIDE
And the SMILE on the FACE of the TIger.
When you read that, the words or syllables in capitol letters are called stressed. The rest are unstressed.
Hope this helps.