Not entirely serious, no. But could you imagine if that happened in front of a bunch of RL friends? Hot shit, he'd have to move to another city. Daaaaamn.
What do you mean by "that?" Do you mean like being at a roleplaying convention when he's not supposed to be, and then his mom, who is already there in costume, busts him?
Because in that case, moving to another city wouldn't be enough. Hell, moving to another
country might not be enough. Word would get around.
ADDITION: Oo, but you know what would be even worse? If your mom, the dominatrix, showed up to chat with your friends, including the girl you have a crush on! And the worst part of the encounter would be when your mom refers to you with a childhood nickname.
OH SNAP!!!!