Break the seal

v.

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Your first wee in the pub, usually after about two hours of drinking. It is desirable to hold off breaking the seal of your bladder for as long as possible because after breaking it, repeat visits to the toilet will be required every five to ten minutes for the rest of the night.

In use

Mickey: "I haves to go break de seal an' strain de spuds cos' I haves TB boy!" Johnny: "TB?" Mickey: "Yeah, Tiny Bladder!"

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Good evening. Sherry? Would you like me to translate 'Break the seal' in use for you?

'I must go and break the seal, for I suffer from TB.' 'TB?' 'Indeed, a Tiny Bladder!'