More profane Netspeak variation of smh, meaning "shaking my motherfucking head". An expression of general disdain for an event or statement.
IM conversation:

Userguy1: So... do you shower every day?
Usergirl25: smmfh...
Userguy1: ...
Userguy1: ...what was that for?
Usergirl25: What kind of question was that? Of *course* I shower every day! Don't you?
Userguy1: ...
Por Blackbutterfly 24 de enero de 2007
Shaking My Motherfucking Head
Horny Teen 1:Yo I heard your sister was sucking dick.
Cocksucker's Brother:Again!!!!(runs off)
Horny Tenn 2:SMMFH
Por BishopLoveBug 25 de febrero de 2014

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