It can't be his mom because, at the time of that posting...
...she was dead.
Oh now-- don't do this to me.
I guess that does it for "yo mamma" jokes.
Please, by all means, mock her...
She only gave her life in an attempt to save a busload of Peruvian schoolchildren from falling off a cliff to certain death.
100 pounds of **** in a 25 pound sack.