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2.
Super Massive Bum Hole, when someone has a very wide builders bum.
"LOL, today Mandeep had a SMBH!!!" Dan said
"I know, I almost got sucked in to her SMBH =" Kelly replied
by Dan Milner April 29, 2008
 
1.
Shaking My Bald Head
An alternative form of the acronym "SMH" for those who are bald.
Just to be different, Dillon has officially adopted "SMBH" as part of his texting jargon, instead of plain SMH. He assumes that most bald people like himself, would appreciate the distinction.
by Elan Vital December 08, 2011