used as an abbreviation in short messages/comments etc on social media. In face-to-face conversation it is signalled by the timeout gesture. OMG like that's so tmi.
"Holy fuck, Barryitwasi from Akun is the embodiment of TMI, he shared that he ejaculated 4 times back to back in the general chat of a discord server, there was no reason for him to share that, nothing prompted that."