Optional AFK message when typing in slash AFK

Suggestion

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Hi there!
Here's a fun fact - on the online MMORPG EverQuest which I played a ton of back in the good old days.... they had the slash AFK command as well, like you do. However... if you typed slash AFK with any words after it, those words would come back to someone trying to send you a "tell" or message or reply.
Funny one, junior high bathroom humor type level of mentality though, was a halfling druid on EQ once set his AFK message to just "Poopin'!" See how funny and great that could be if we could "set" our afk messages than to just "so-and-so is away from keyboard." Right?
Another example. I like to do 7/11 (mini-market) runs, now and again during playing long stretches of Minecraft on here. So I* would put something like "Gone to 7/11 - be back soon."