IHTN 

IHTN is a short term for someone who has to nut, meaning "I Have To Nut." Sometimes also replaced by IHTC meaning "I Have To Cum" or IHTE meaning "I Have To Ejaculate."

Sally: Hey John, can you come over and play Roblox?

John: Not now Sally, IHTN.

IHTN by A fucking simp November 14, 2020

ihtn 

I hate this n!gga; he irritates you in every single way and can’t do anything right

Ihtn he can’t ever make anything easy or get along

ihtn by Carmenn3002 May 23, 2023

IHTNLTS 

Abbv for "I Hope The Neighbors Like This Song". Meaning you are playing a certain song very loudly(and possibly repetitively.) As would be used with a twitter hashtag or social network status update.

#IHTNLTS:
The Naked Famous - Young Blood

IHTNLTS by MusicManSteve April 13, 2011