Thanks for that Melani,the missing term is presumably 'berk' though why anyone would wish to asterisk this out is beyond me.
Just to totally confuse you, 'Berk' is pronounced as spelt, but is originally a contraction of the rhyming slang "Berkshire/Berkerley hunt" both pronounced "Bark...". Nonetheless a great modern shanty.
I was intrigued by your original posting and did a quick search to try and find anything to add, and found that amongst other delights, this company offers 'clothing optional' cruises and there are pictures to prove it! I must admit the last thing I would want on a sailing ship was anything swinging free to get caught by any passing line. Gives a whole new visualisation to "Irish pennant" though.
Pete M