Fuck Infinity is the theory that when one says the word "fuck", (or alterations of the word) multiple times continuously in one sentence he or she enters Fuck Infinity, thus not being able to stop saying the word (or alterations of the word) "fuck".
A phrase from popular YouTube star, "Alpharad", its a spin on the phrase of Buzz Lightyear, "To infinity... and beyond", but its funny because someone online said it