Real Dictionary

Teflon
uncountable noun: Teflon is a type of plastic which is often used to coat pans. Teflon provides a very smooth surface which food does not stick to, so the pan can be cleaned easily.

Teflon in American English
a tough, insoluble polymer, used in making nonsticking coatings, as for cookware, and in gaskets, bearings, electrical insulators, etc.
regarded as having the ability to maintain one's standing or reputation in spite of scandal, wrongdoing, etc.
this substance, esp. as a coating
adjective: characterized by imperviousness to blame or criticism
noun: a fluorocarbon polymer with slippery, nonsticking properties; polytetrafluoroethylene

Teflon in British English
adjective: denoting the ability to evade blame
noun: polytetrafluoroethylene, when used in nonstick cooking vessels