Gomit is when you combine the words gag and vomit. This usually happens when something is seen as extremely gross something that just sucks. There are many times when you see something and nothing comes to mind this is a way to describe it better.
Did you see that ugly couple making out?
Yea i totally did, GOMIT. Kinda wish i didnt.
Hey wanna go try that new double down from KFC?
How bout no, GOMIT!