The Brief: 'Iykyk' is an abbreviation for the internet phrase -"if you know you know" which tends to refer to a specific situation.

DEEP DIVE
‘Iykyk’ is a millennial phrase and hashtag that was coined in the early days of social media that is heavily used on Twitter and Instagram captions. The response tends to outline a sense of relatability which refers to specific situations that may be of a certain type of person, group, or demographic.
In other usages, the “if you know you know” abbreviation paired with a certain emoji may correlate to a mischievous situation that associates with irresponsible behavior. ‘Iykyk’ is used for inside jokes as well to relate to another person who may understand that specific joke.
its crazy bc no one knew the last time was gon be the last time it just happened. iykyk. https://t.co/Ew1bTkhiAb
— 𝒄𝒂𝒎 𝒄𝒂𝒎 🍬 (@badgirlcammi) March 10, 2020
this my fav pic on the internet right now. iykyk. pic.twitter.com/hnXRDLZiSx
— Bawse Kitty (@BawseKitty) March 17, 2020
This quarantine is going to have me only eating rice and beans but I'm no stranger to that 😂🥵 #IYKYK
— el xiNAKo Chamaco (@EddieeChavez) March 18, 2020
Tweeting this so I never lose it 😂😂😂😂🤣 IYKYK pic.twitter.com/2ggLOLid2H
— Trayveon Williams (@TrayveonW) March 15, 2020
What quarantine would look like in 2010.. #IYKYK pic.twitter.com/Tf62BJvXQr
— Joe (@Joe_4_E) March 18, 2020