He is 100% correct the correct term is taking the piss. Would you have understood better if he said you taking the mickey? or you having a bubble mate. I think not, but just because you do not understand or use the phrases we do does not make them dumb. We don't call each other derps either. But I would some you up in one English word MUG
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Did a stripper raise you? Because you sure got a mouth like one. Carry on hag, your terms still don't make sense. "Taking the piss about his tattoo?" Where is said urine going, and how does it relate to a tattoo?