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A social media app where you're completely anonymous and can chat with people in your area. Usually it's used by teens for bitching about people at school, spreading gossip, and the occasional stalker talking about how hot so-and-so was that day. Because the app has rules against naming people, you'l often see pitiful attempts to cheat this by listing the persons initials when the shit talking starts.
Guy 1: "Damn, did anybody else see M.F's ass today in the hallway? I got like so hard. Too bad she's dating that faggot T.B"
Guy 2: "Wat"
Guy 3: "Dude, stfu. You're gonna get Yik Yak banned from our campus!"
Yik Yak by Mr. bIG D August 27, 2015
vomit (from the thai)
child vomits

Old Man: "Yik yak!"
yik yak by PhyllisDean August 6, 2009

Yik Yak Tik Taks 

Methylenedioxymethamphetamine, most commonly known today by the street name ecstasy, (often abbreviated to E, X, or XTC
u rolling...? Yeah maane took 2 yik yak tik taks...now im....SUPA Riiiiiggggght!
Yik Yak Tik Taks by Keovani® October 24, 2007

Yik Yak Warrior 

College students who aimlessly seek out brawls on Yik Yak. These individuals spend countless hours brainstorming sinister yaks targeting peers or current events.
That nerd has Yik Yak warrior written all over himself.
Yik Yak Warrior by JohnnyGolfball September 18, 2016

It's like yik yak 

Used to brush off confusion, correct someone gently, or exit a convo without explaining. If someone misunderstands you, spirals into overthinking, or misses the point, you simply say: “it’s like Yik Yak.”
It’s like saying “never mind”.
"Oh! I didn't know we were supposed to wear red today!"
"Omg babes, it's like yik yak, no worries"
"Okay, thanks I was so nervous"

YikYak RoadTrip 

Driving somewhere specifically for the purpose of posting Yaks in that geographical area. This is typically motivated after having used the Peek feature to read Yaks in another geographical area and being unable to respond to those Yaks from your current location.
Dude1: Dude, did you see those Yaks from that girl in the next town over?
Dude2: Yeah man, I want to respond with my SnapChat id but I can't from here.
Dude1: Time for a YikYak RoadTrip !!!!
YikYak RoadTrip by oibeachnc December 23, 2014