You know what these are - they're the chili peppers that make Mexican food hot. They're smoky and delicious so long as you have the stomach for a little spice. Unfortunately for you, serving staff in Mexican restaurants have probably been laughing behind your back every time you've asked for a dish containing it.
"Chipotle" is not pronounced "chip-oat-lay". That's not how Mexicans tend to pronounce the letter 'I'. Nor is it pronounced "chip-otel", which you may also have heard people use. That just sounds like a chip hotel, which would be something completely different, and wonderful in its own right, but still very wrong. The correct pronunciation is "cheep-oat-lay", like you've found a cheap bed to lay your oats down for the night. Hopefully that strange image will help you remember how to say it right in future.