markdown 

an idiot or extremely stupid person. origianlly used by the employees of Home Depot when talking about an item that was half-priced due to damage of said item.

Billy: dude, i got a 45 on my history test! haha!

Joe: Billy, you are such a markdown

markdown by Antonia!!! October 23, 2008

Maya markdown

An attempt to get into a girls pants by discounting their car insurance.

Maya: "You did me a solid with that , uh, Maya markdown on my insurance."
Jake: "No. Really. There are no markdowns, just great rates"
Maya: "Pull around back in twenty minutes. I'll hook you up with the good parts."
Jake: "When you want the real deal....."

Maya markdown by feed the dogs January 4, 2021

mackdown 

Any event wherein some serious macking is going on. See: mack

You shoulda been at Otter's last night, it was a serious mackdown.

mackdown by Fargo April 8, 2004

markdonalds

An old RuneScape slang that was used to offend the jagex mod “Mod Mark” because he was fat. For a while using the phrase “Markdonalds” led to a permanent mute.

Rs2 player in 2008: heh… markdonalds rolling out another shitty update…
in game chat you have been Muted for an indefinite amount of time. Play nice!

markdonalds by Gingerbreadbedhead September 21, 2023