a fat greenie is when you have a thick lump of green/yellow phlem in the back of your throat and you spit out and it's all slimy and lumpy and thick.
"bro i just spat a fat greenie"
"jeeez that's rank"
Verb
when you are right about a homework problem and the teacher and or professor is wrong, or when the teacher makes a error on the homework, or have a rounding error
You rounded to 3.20 instead of 3.21 get Geenyed
Hey sir there's a error on the homework and I got Greenyed by it
Dude I spent a hour on the problem only to find out there was a error in the system I got Greenyed so hard