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The act of filling a glass, cup, or bowl with warm water, dipping one's testicles into said water, and enjoying the sensation while a generous friend blows bubbles with a straw.

Can be used as a noun or verb.

Synonyms: nutsack hot tub, junk jacuzzi
I can't wait to relax with a good chumble.

You seem stressed. When's the last time you chumbled?

Hey man, could you give me a quick chumble?

Sorry Mom, can't talk right now, chumbling.