It's a quote from the ancient sit com, "Filthy, Rich and Catflap" by the character (covered in fag ash) played by Nigel Planer.
The idea is the cough is so violent that it sucks the testicle up the inguinal canal where it is literally blasted though the wall of the colon, downt the rectum and...
I'm sucking in air between my teeth. Awkward.
Mine is lovely. But it needs an iron after the wash, and don't bother with the extras (decals) because they peel off just by looking at them funny.
Sorry, I shouldn't have gone into such detail under these unfortunate circumstances.
Lovely shirt...