Oh good, I'm not alone in my love of (intentionally) mangling words. Like Jel-ap-a-no or Nah-kohs or Tah-chohs or Tor-til-lah. Although in all seriousness, my sister still says "Tor-teel-lee-ah".
Regarding the original post... in Spanish (which is what chipotle is) the "i" usually makes an "ee" sound, like in "feet" (rather than like in "elephant" or "if"). So the proper spanish pronunciation would, I think, be closer to "Chee-poht-lay", with the "o" like in "pot" (rather than in "oat").
Since living in England and experiencing how people from 20 miles away have completely different accents, I love linguistics.