The limit as effort (x) approaches infinity of going 'balls to the walls'. When graphed, balls through the walls can be shown as a hyperbola approaching an asymptote. This asymptote represents the proverbial wall in which balls go 'to' and eventually 'through'.
Side effects of going balls through the walls are: excessive dehydration, headache, fever, fatigue, and most likely death. Those who survive going balls through the walls are either really lucky, or the absolute quintessence of badassary.
I was running the other day and I went balls through the walls; Cullen and Ty couldn't keep up.
I tried going as balls through the walls as Mennell, but then I ended up in the hospital. I'm lucky to be alive.