Given to people who can't stop whining (whine), so that's complaining.
Often given to whiners on the internet, on forums but maybe even the most in online games.
Img#1. Example of a whinebox: |____|
During online play a whinebox was given...
# Unknown Soldier: Hacks
# Unknown Soldier: Stop hacking! :( Wallhacker!
# Unknown Soldier: ..DUDE, you suck you can't play games hacker hacker hacker.. ;(
# Second Soldier: OMG, |____| , Go whine in there.