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!. To be slapped by a clown, usually (but not restricted to) of Ronald McDonald's appearance.

2. To be bitch slapped by a McDonald's employee.

3. To strike someone in order to steal their fast food meal.
1. I tried to give that clown over there a hug, but I guess he was in a bad mood. I got McSlapped!

2a. I didn't want fries with my meal, and the dude behind the counter McSlapped me! So much for "We love to see you smile, huh?"

2b.I swear to God, I'm going to McSlap that customer if he asks me one more time if I want the Happy Meal in his pants.

3. Person 1: "...So then I came into this clearing and saw a family eating some fast food at the Picnic Benches."
Person 2: "So what did you do?"
Person 1: "Well I was so hungry, I snuck up behind the guy, McSlapped him hard, and ran away with his Big Mac and Fries. It was so worth it."
McSlap by A Fizzle Dizzle August 20, 2008
Related Words

Mac Slap 

Striking someone in the face with an apple product such as an iPad or macBook.
Oh Dude, you just got mac slapped. Shoulda kept your mouth shut.
Mac Slap by swed-guy May 29, 2013

mcslappy 

A named used to call an Irish man and/or woman that enjoys slapping.
Watch out for that mcslappy!
mcslappy by fdsiolsfk January 3, 2008
The act of being slapped in the face by another man with a stern face and a furrow in his brow.
When Matt told Cameron he looked like a rat fuck, Cameron walked up to Matt and man-slapped him.

Did he just manslap him ?
Manslap by Mr. Dheim January 22, 2014

Happy McSlappy

A troll on the internet who has deemed himself "Lord Internet". He can often be found on Facebook and Xbox live. Is known for pissing off everyone and taking pride in being an asshole.
Facebook girl: Happy McSlappy won't stop trolling my Justin Bieber Statuses!
Guy: That's because you deserve to be trolled by Lord Internet for liking Justin Bieber lol
Happy McSlappy by Awesomesauce1966 September 6, 2012

Masslapk 

When you pull someone’s face mask back and let it go, causing the mask to slap them in the face
He masslapked me, so I hit him with a bat
Masslapk by Anosmodnar April 11, 2022