A thermal, cotton, elasticated pouch, or 'sock', sold in specialist outdoor clothing retailers, which is used to keep the testicles warm in colder climates.
It's getting pretty nippy out there with all that frozen fog. I'd be sure to slip on your bollocksock before we set off on the hike.
Person 1: Did you hear that Charlie got passed over for that promotion again?
Person 2: Jeesus, that's like the 20th time isn't it. When is that guy gonna learn that he's wasted 30 years of his life in that job - we've known for years that he's just not cut out for that type of work!
Person 1: Yeah I know, he's so fucking blind to his situation though - stupid bollock eyed prick!!
Person 2: Yeah, those fucking bollock eyes of his - Jeesus!