So like under your name on the forums it will say something like "Member" or "Forumite" or "ub3r" depending on how much you've posted. But how do you get a custom one? For example "its a custom thing"

you use TC http://forum.toribash.com/tori_usertitle.php

oh yeah i forgot to mention, with toriprime it's a discount to change it, and with VIP it's for free how much you want

This too.

I bought mine for around $7.5 like 1 and half year ago (current usertitle)

This is not available ATM since sir is inactive.
Managed to get some of those customizations for tc (15k/usd rate) but a. I doubt they will do it anymore until they actual make that publicly possible and b. they did not want to sell me the usertitle custom as the usertitle shop exists.

Im going to close this, seeing as the question has been answered.