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1.
The act of sighing or being in an angry state. Or using it in replace of any word.
"Shmah , somebody ate my best friend"

"We'll just put it over shmahh. (CARTMAN)"
by Agent Fluff December 24, 2011
 
2.
Its a girls on xbox lives gamertag... also her nick name ... nothing else
'What does Shmah mean?'
'Its my name retardtard...'
by Shmah March 30, 2005