This was actually a brilliant bit of mental testing for the players on the part of the devs.

If you assume he means something like his dick is too small, ie. the big guy overcompensating for his lack of manhood with physical size, then you're probably a dicklet yourself.

Conversely, if you assumed he meant that he's such a peak specimen that his even his cock is too big for a human woman to handle, you're likely a big dick Chad.