Taking the mick/mike/michael are variants of "Taking the mickey" which is Cockney Rhyming Slang. In full it is "Taking the Mickey Bliss" rhyming with... taking the piss meaning to poke fun at someone either humorously or aggressively. Sometimes reworded to "extracting the michael"
Are you taking the mick/mickey? (extracting the michael)
Calm down, I'm just taking the mick/mickey.
Relax, he's only taking the mick/mickey.
"That was funny!"
Her prominent eyes swam with tears as she gasped for breath, staring at Ron. Utterly nonplussed, he looked around at the others, who were now laughing at the expression on Ron's face and at the ludicrously prolonged laughter of Luna Lovegood, who was rocking backwards and forwards, clutching her sides.
"Are you taking the mickey?" said Ron, frowning at her.
"Baboon's … backside!" she choked, holding her ribs. -Harry Potter and the Order of the Phoenix
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”
Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.