A mixture of the phrases 'put hair on your chest' and 'grow some balls' and maybe the phrase 'put hair on your balls' numerous phrases to emphasise the need to grow up, or be brave or strong. Also a mockery of chesticles as putting balls on your chest would mean growing breasts in theory
Drink this it will put balls on your chest
Bringing back the much need word hussy (an uncontrollable person who identifies as female/is female)
The addition 'a' is to bring it the modern era, I belive it gives it a modern twang when prenouced like 'pussay'