A business smaller than a micro-business. A microscopic business has only one or two employees and its headquarters building is so small you can't even see it.
When someone compliments or says something nice to your girlfriend/boyfriend and you do nothing about it or are totally fine with it. Microcuck is a fusion of the terms microaggression and cuck (cuckold). Essentially getting microcucked is getting cucked in the smallest way possible.
John: Wow! You are absolutely beautiful
Bob's girlfriend: Thanks! That's so nice!
Bob: *does nothing* (or says something like "that was nice!")
An insult to refer to Microsoft for their errors in console gaming ventures, such as the way the backwards compatibility in the x-box360 is flawed and has trouble working sometimes with what should have been easy games to incorporate into the system. Thus the angry response of "Damn you Microsuck!"
And possibly a "Dear ass faces letter"
Murphy:Dude whats wrong?
Ryan:Damn Microsuck and their stupid system!
Murphy:What?
Ryan:Okay if the game lags out during KOTR2 and I die at the START thats a fail on Microsuck.