Meanings
From double (“twice, i.e. more than”) + Dutch. For sense 1: Dutch (which historically had a wider meaning) as a foreign language was not easily understood, so anything completely incomprehensible would be double Dutch, i.e. twice as hard as Dutch. Sense 2 expands on this meaning.
How to pronounce "double Dutch":
AU
Incomprehensible language.
A language game akin to pig Latin.
A game of jump rope with two ropes and frequently two jumpers.
Sex using a condom and the contraceptive pill at the same time.
Example Sentences
1
I can't understand a word they're saying, it's like they're speaking double Dutch.
2
When it comes to technology, it's all double Dutch to me.
3
I tried to read that scientific paper, but it was written in double Dutch.
4
She explained the concept to me, but it went in one ear and out the other, it was double Dutch.
5
I felt lost during the lecture, everything the professor was saying was double Dutch.