Its when the queen or another female member of royalty owns or pwns you
the king: I will own you at Call of Duty

the Queen: Bring it

1 minute later

the queen: woooh headshot!

the queen's assistant: oooooh the king got ma'm-ed!
by Olberoony April 03, 2010
Get a ma'm-ed mug for your cousin Rihanna.