Dedicated with all credit to Jax, the original creator of this message board, who had left the site a while ago but whose account, along with all their posts, was only recently deleted due to a glitch in the website. :(
The premise is utterly self-explanatory: What, in fact, is the last thing you said out loud?
I haven't verbalized anything in the immediate past, so instead I'll use this space to memorialize Jax's immortal line, from September 13, 2015:
"that's not a math, that's a Karkat."