"Blue balls" is a slang term for a medical condition called epididymal hypertension. This condition occurs when prolonged sexual arousal without ejaculation causes fluid to build up in the testicles.

Reference: “Single-cell imaging reveals efficient nutrient uptake and growth of microalgae darkening the Greenland Ice Sheet” by Laura Halbach, Katharina Kitzinger, Martin Hansen, Sten Littmann, Liane ...

"If you have seen a partial eclipse, then you know how cool these things can be. If you haven't, then it's going to rock your ...