A number of posters used it on another thread.
At first i thought is was just a typo but when i saw it used more than once it became clear that it wasn't. Granted this question is coming from a person who didn't realize "USR" was a reference to me, but i am on here a lot a don't recall seeing "msm" before.
Answer by Sisteract at 6:58 PM on Feb. 28, 2011
Answer by agentwanda at 7:03 PM on Feb. 28, 2011
Answer by cbk_mom3 at 6:58 PM on Feb. 28, 2011