Similar to an Irish Goodbye, an Irish Hello is a hen you wait until you are absolutely sure a person is leaving before you make an effort to acknowledge their presence. It’s a dick move but everyone does it so get over yourself.
“Roger is finally leaving. Let’s go over and give him the ol’ ‘Irish Hello’ so he doesn’t think we’re dicks and invites us back to his sick beach house next summer. Man, I hate that guy.”
by Harmonica John October 14, 2018

The first program a programmer writes of a given language is usually written to print out the phrase "hello world" to test basic skills.
by Thrash January 24, 2004

by kananakook May 29, 2009

This is when a man is performing oral sex on a woman and doesn't know she's a "squirter" until it's "too late".
I took that hot bitch home from the bar and went down on her but she pulled a hello kitty on my ass.
by Chicagodan November 15, 2011

peter griffin: holy crap im in fortnite! oh my gosh, this is so freakin epic!!!! holy crap, donald trump?
donald trump: hello peter, welcome to fortnite.
donald trump: hello peter, welcome to fortnite.
by the cooler penguin27 July 11, 2022

walking down street "Hello-Biff! I've been gone a long time Biff!" person being greeted is named John
by LRS1998 February 20, 2009

the most common type of sleep paralysis demon. also in some mediterranean areas it is used as very offensive curse word.
kid: hello kitty
teacher: IS THIS A JOKE TO YOU? DO YOU WANT TO BE EXPELLED?
AHHHHHHHHHHHHHHH! MOM! THERE'S A HELLO KITTY IN MY ROOM! WAHHHHHHHHHHHHHHHHHHH!!!!!!
teacher: IS THIS A JOKE TO YOU? DO YOU WANT TO BE EXPELLED?
AHHHHHHHHHHHHHHH! MOM! THERE'S A HELLO KITTY IN MY ROOM! WAHHHHHHHHHHHHHHHHHHH!!!!!!
by SIlkeeeeeeeeeee July 18, 2020
