To show one's buttocks to someone in a stylish and elaborate manner as an expression of condescension, in particular in cases in which the receiving person has asserted unnecessary and unwarranted claims of possession over something or someone.

The expression has a connotation of subtlety: It is often understood that the intended recipient is not aware of the move, while people in the know will recognise the gesture easily. The move does not need to include literal showing of the buttocks; an allusion to such a gesture is often understood when speaking about "doing the Markus".
She's doing the Markus right in front of him, and he doesn't even notice.
by jeang85 January 6, 2018
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When you ask for a round and are the last to come.
Dude why did you pull the Markus on us??
Sorry i was golfing the whole morning and didn't tell you because why the fuck should I.

My girlfriend was doing the Markus on me yesterday ...
by YoloGunthi123 October 10, 2021
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