RTI mimic is something that has the same symptoms an a RTI, but isn't. Like in the case I explained above about my RRS, she had respiratory inflammation from the fumes from her plastic hide.
( pasted from other source)
http://www.anapsid.org/rti.html
RTI Mimics
Other situations and conditions that may cause symptoms similar to respiratory infections are inclusion body disease in boas and pythons and ingestion of toxic substances -both of which require veterinary diagnosis and, in the latter case, intervention. Choking or gagging on a piece of food or foreign object may result in temporary excess saliva. Being handled too soon after eating or drinking may result in water being regurged and spit out;
since it is now mixed with saliva, it will be rather viscous rather than thin like plain water. If too soon after eating, some food may be partially regurged and stuck in the throat which may cause increased salivation. No other signs of RTI occur in these instances, so they are easily told apart from an RTI.. Some reptiles may exhibit signs of respiratory infection as a signal to you that they have been handled enough or want (or need) to be put down.