If questioning the size of their actual testicles: It would depend on whether the puritan in question is a male, and what the person answering would consider "big".
If questioning the size of their metaphorical balls: Matter of opinion, really.
as big as my balls balls balls balls
big balls
yours big
my balls
it means you have big balls+ it means you have big balls+
As big as your balls
as big as his mole :)
Zorbing balls
big balls
sterioids
I dont know why my balls are big, and i dont know how you can compare them to your penis, where as i have never met you.
Balls and Big Hairy Balls