Butterflies

Butterfly, v. To retcon out of existence using butterflies.
Butterflied, adj. Retconned out of existence because of butterflies.
A Point of Divergence causes a lot of knock-on effects, some big and immediate, some subtler and over time. Any of those changes, especially second-order (changes caused by changes) and beyond, are called butterflies.
Compare with Butterfly Nets, which are used to keep these under control.
Category:AH Tropes 101