When an anarcho-capitalist suddenly converts to a far-left ideology, often anarcho-communism.
Anarcho-Capitalist; "Hey dude, will you join our capitalist discord server?"
Anarcho-Communist; "Sorry man, but I don't like capitalism anymore, I might go and pull a badmouse"
Anarcho-Capitalist; "TRAITOR REEEEEEEEEEEEEEEE HELICOPTER RIDE REEEEEEEEEEEEEEEEEE"
The adjective "Ballmouse" originated in Hull University halls of accomodation. During a LAN gaming session, a particular player would often be disadvantaged in the game by their use of a wireless ball mouse - (as opposed to a corded optical mouse)
During a game of Counter-Strike for example, a player may screw up their aim, miss, and get a pummeling from another player. One of the other players then yells "BALLMOUSE!" very loudly within earshot of the player that messed up - and raucous laughter ensues.
The word has since evolved such that it may be called out a someone being self-detrimentally stupid or proving their idiocy to themselves through their ill thought out actions.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.