Inventor, Rachel Bagby
Dekaaz has 10 syllables in 3 lines:

1) 10 syllables
2) In three lines2/3/5
3) That you speak aloud to another living being.

Merely writing 10 syllables 2/3/5 does not a dekaaz make. Dekaaz aren’t true dekaaz unless shared out loud. Inspired examples of the form can be found on  the creator’s website:

Here’s one:

Driving Lessons

Cat’s eye
To cat’s eye
We mouse through the fog

My thanks to Rachel for elucidation and example..