Brandon's number

"Let's go, Brandon!" -- originally supposed to be a cheer for NASCAR driver Brandon Brown -- is now code for a vulgar execration beginning with the letter F.

Brandon Brown's number is 68.

Q is the 17th letter of the alphabet, and so the number 17 is synonymous with the letter Q.

Brandon Brown's number is thus equal to 4Q.

And 4Q is code for a vulgar execration beginning with the letter F.

Thy firmness makes my circle just, and makes me end where I began.