(n.) an emotional experience triggered by someone else's ringtone. The particular ringtone is typically associated with a specific event or person. This event occurs often with iPhone users because of its popularity and limited ringtone options.
1) Steve's ringtone is my alarm on my phone. Every time he gets a call I have a RINGTONE FLASHBACK, and I want to stab him in the neck.
2) So every time Sally gets a text message, I kinda get a half-chub. She has the same ringtone as April-Big-Cans. I get a RINGTONE FLASHBACK to last summer every time.