A variation of the phrase 'breaking the seal' whereby one often has to go to the toilet frequently when drinking, once they have gone for the first time of the evening. However, this version can have a variety of misunderstandings that sound like one is about to commit/has just committed an animal rights abuse.
Used mostly in parts of Lancashire and Cumbria, and in particular Lancaster.
Where have you been?' 'I have just been clubbing the seal'