Note that this nonstandard pronoun, though it refers to the speaker/writer/user chatting, is third person, not first person. So, to take an example, I get out my pen, but /me gets out his pen; this is because it is generally replaced, when the first word in a command on IRC or in the chatterbox, by the username of the chatterer. Usually the message is also italicized (as here) or otherwise marked.
Note that the other third person pronoun in the sentence (his) still must agree with its antecedent, /me. If I were female, I would write "/me gets out her pen".
On IRC or in the chatterbox, something being said rather than "done" is generally placed in quotation marks when after a /me. Example:
/me fumbles around for the orange smoke in his backpack... "Aha! Here it is!"
I use this regularly both online and in face-to-face conversation.
premchai21 vanishes in a cloud of orange smoke