When a completely straight guy gets involuntarily aroused by another guy (not necessarily lustfully, simply arousal). A very awkward situation. Green balls cannot happen to a gay dude. One must be straight in order to get green balls.
"Jeff got green balls when Nathan reached over his lap to grab his soda."
by Aprice January 08, 2008
The state of being in which one is deprived of Call of Duty for extended periods of time. Similar to the condition of testicular congestion commonly referred to as "blue balls".
"Dude, I've got the green balls so bad. I'm only sixteen M9 kills away from getting my tactical knife! I haven't been able to play in almost a week!"
by Black Mariah February 11, 2010