Looking for DJ Shout-out's / intro's / drops?
Radiodaddy.com is very reactive to these requests. They have a forum dedicated to DJ Drops: http://goo.gl/fdjwA
The reason I'm posting this here: While I'm not a big contributor to the free sound site, the site is focused mainly on building up a big database of sounds. Adding sounds like "You're in the mix with DJ " isn't beneficial to a whole lot of people on free sound. People come to this forum often asking for DJ Drops, but I think these people might do well by going to radiodaddy.com, where it looks like people respond within hours for vocal requests.
I'm not affiliated with either freesound.org nor radiodaddy.com. This is just a personal observation. So by all means, if this topic is on the bounds of acceptable, I won't be offended if it's taken down. I just thought I'd post this in case it saves people time/effort.
Also of note: if you're looking for vocals of a specific nature, people on radiodaddy.com are very responsive, so check-out the other forums they have regarding vocal requests:
That's not to say that you couldn't request the samples over on radiodaddy.com, and if they're released as CC0 (or any compliant license), post them up on free sound