“I’m working on my résumé. Should I use ‘mad skillz’ or would ‘mad skills’ be more formal?”

“Mad skillz” is slang for “very skilled.”  A joke was posted on Twitter by “Polythene Spam” on April 1, 2010:
   
“I’m working on a cover letter. Should I use the term ‘mad skillz’ or would ‘mad skills’ be more formal?”
 
“Cover letter” is often changed to “résumé.” “I’m working on my resume. Should I use the term ‘mad skillz’ or would ‘mad skills’ be more formal?” was posted on Twitter on September 17, 2010.
 
   
Urban Dictionary
Mad Skillz
Extreme amount of skill in a specific area.
You capped 9 homies in one night? Daaaaaaamn, you’ve got mad skillz homez.
by Goodie October 21, 2002
 
Twitter
Polythene Spam
‏@BettyLies
I’m working on a cover letter. Should I use the term “mad skillz” or would “mad skills” be more formal?
6:59 PM - 1 Apr 2010
 
Twitter
Ryan Owens
‏@rowens41
I’m working on a cover letter. Should I use the term “mad skillz” or would “mad skills” be more formal?
10:41 PM - 1 Apr 2010
 
Twitter
Amat Victoria Curamॐ
‏@BR_Nation
I’m working on my resume. Should I use the term “mad skillz” or would “mad skills” be more formal?
5:33 PM - 17 Sep 2010
 
Twitter
ree-ree
‏@rrstweets
I’m working on my resume. Should I use the term “mad skillz” or would “mad skills” be more formal?
8:17 PM - 17 Sep 2010
 
Funny Status
I’m working on my resume. Should I use the term “mad…
December 5, 2013 Work Status Updates
I’m working on my resume. Should I use the term “mad skillz” or would “mad skills” be more formal?
 
Twitter
Clint Bond‏
@ClintBond
I’m working on my resume. Should I use the term “mad skillz” or would “mad skills” be more formal?
4:33 PM - 8 Dec 2013
 
Twitter
Bill Murray
‏@BiIIMurray
I’m working on my resume. Should I use the term “mad skillz” or would “mad skills” be more formal?
1:30 PM - 26 Feb 2017