Top definition
The feeling you get in a long term relationship when you develop a crush on someone else for a short period of time.
I love James and i'd never leave him, but i think i have a slight crush on Will! Ugh i must have shiny new toy syndrome, it'll pass in a week!
by feelingprettygay January 22, 2017
Get the mug
Get a Shiny New Toy Syndrome mug for your coworker Beatrix.