Short phrase, used to threaten the listener of the speaker into not doing something they've just spoke of. Similar to don't you dare, but it more accurately translates to "if you go and do said thing, I will make sure there are consenquences".
Speaker 1: I am going to tell your mum about what you just did!
Speaker 2: Etsi kai!
Speaker 1: What will you do? Deny it?
Speaker 2: Etsi kai!
Speaker 1: What will you do? Deny it?
by Hmanasou23 July 28, 2021
Get the Etsi kaimug. Breaking pandemic lockdown rules, for a shitty 60th Birthday, and then falling on your sword thinking that Sky News would say ‘it’s alright love’.
The epitome of selfishness and self indulgence.
The epitome of selfishness and self indulgence.
by Muscat JP December 11, 2020
Get the A Kay Burleymug. A person you would love to meet. He very nice at first but after some time he gets annoying, Kai is a guy that loves fortnite, and he can also be a Jewish person
by Doctor peniss November 11, 2018
Get the Kai Elranmug. 
fa-Kay means fucking face. Fucking has multiple meanings so you can use it a couple ways. See example.
Example 1- shut your fa-kay!
Which means to shut your fucking face.
Example 2-I am fa-kay!
Which means to fuck in the face.
Which means to shut your fucking face.
Example 2-I am fa-kay!
Which means to fuck in the face.
by Cap k April 6, 2019
Get the fa-kaymug. You are my best friend and the most famous person I know on Tik Tok. You're always there for me when I need you and I can always talk to you about anything. I can trust you and even though i'm literally the worst friend anyone can have you're still here.
by Ava.Marley January 11, 2022
Get the Audrey Kaymug.