I hate you
IHU - why do you always get to go on vacations?
|IHY||I hate you|
|IH8U||I hate you|
|I8U||I hate you|
|182||I hate you|
|HML||Hate my life|
|TIHI||Thanks, I hate it|
|Haterade||The drink of someone who disapproves of another's actions/lifestyle|
Someone who strongly dislikes you may use IHU to mean "I hate you." Friends and family might also send you this acronym, typically in jest. (Not your brother Phil, though. He really does hate you.)
For example, if you tell your Pharb-loving friend that you have tickets to Phoebe Bridgers's next concert, they may send back "IHU." To turn this IHU into an ILU, you could invite your friend along.