Last Word 4-

Usually found in Floptok and Barbie community, Last word 4 (name) is the meaning of somebody winning a fight, argument and getting too tired of winning.

If you dont block the person after last wording and they manage to say something it's embarassing, but usually meaningless.
Also people usually use glittertextonline to make gifs, or capcut edits saying LASTWORD4 (name) or even hiring Fiverr people to say the message.