An action which implies that you drink any type of alcohol which has been poured onto your friend's balls before consuming.
"Oy Calum ye fat cunt!"
"What the fuck is up with you James you naughty twat?"
"If you call me a naughty twat again Calum, I'll fucking make ye drink from the wallet I swear on me mum"
Balls to the wall did not originate with steam engines, as some of these "authority" figures on the matter state.
Remember, there were no televisions back then, nor radios, the primary media was writing in books and magazines.
An extremely cursory Google search will show you this term originated with pilots OF THE VIETNAM WAR ERA.
(verb, to, the words Southern and Wall always written with capital letters ): to actually get things done, without the bureaucratic red tape, with the least amount of money, in the least amount of time, and still do a good quality job.
even without military or civilian government experience, Donald Trump, IMHO , can still build the Southern Wall, and not be a one-man wrecking crew.