I Googled, and found that "cullions" is an obsolete term for testicles. That about sums up my cullions.
This is a true story.
I attended a school reunion about eight years ago in Germany. Because that's where the school was, we weren't showing off or anything.
Anyway, it was a magical weekend and I met loads of ex schoolmates, got ver' ver' drunk and had a great time.
Nothing happened at the reunion, (sadly) it was all very above board, but I returned with a condition called epididymo orchitis - a massive swelling of one testicle. I remember the instant that it happened. I merely bent forward awkwardly in a chair and there was the small sound of a part-boiled spaghetti stick snapping in my groin. The swelling didn't start until some hours later.
I was thoroughly tested and it was confirmed as non-STD condition, which of course pleased my wife.
Anyway, when I presented my condition to the doctor, I first explained it, feeling that the sight of such a huge swelling in that area might be cause for mirth.
He assured me that he had seen it all and that as a professional he would treat the sight with clinical detachment.
When I dropped my drawers, however, he could barely stifle a guffaw.
That's nothing, says I, the other one's in a truck outside.