1. When a piece of technology fucks you over by turning off or breaking just as you were about to do something important.

2. When something or someone screws you over.

3. When you're so tired that you pass out on the spot.
1. "Man my PC just instacrashed when I was about to level up to Uber Hardcore."

2. "This chick just instacrashed my balls - I really thought I was gonna get laid tonight."

3. "Just as Johnny was about to walk out the door, he instacrashed on the curb."
by Vex Skyler October 1, 2011
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