iyb 

in your butt

my husband keeps leaving my notes that end with iyb after his name

iyb by gloucesterdave1 December 1, 2011

iyb 

improve your brain; used when someone says something stupid

Agata: "I saw this in a dream"
Liam: "Your Psychotic?"
Janik: "you mean Psychic..iyb..."

iyb by keeroonf April 9, 2009

IYBY

An acronym for In Your Butt, Yup.

IYBY is a variant of the "that's what she said" response. It has multiple applications. You can also alter and utilize portions of the phrase: "inside you", or, when shortened "in you".

Person 1: I loooove 5 guys.
Person 2: IYBY

Another example of partial utilization:

Person 1: Yeah, I'm almost ready to take this roadtrip, I just have to finish packing up.
Person 2: Your butt, yup.

IYBY by Bigboy608 July 19, 2018

Iyban 

This name describes a person who dunks on a defender and also describes a person who focuses on their target

Iyban you posterised him

Iyban by EG BOT November 7, 2016

iyber 

Twin sister of Cyber. In the shape of a chameleon.

It’s Iyber!!!!!

iyber by Peeha Auntie November 25, 2019