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An overly-polite sort of girl that uses phrases like "Tee-hee" and "'Scuse me!" all the time. Used to describe a person that acts like a goody-two-shoes.

Originated from the initals for "Samantha Marie Barnes", who is a girl that acts this way. The infamous "SMB Poem" catalogues her trials and tribulations.
My name is little SMB
My favourite saying is "scuse me"
I love Georgene and Lady Barnes
Even if M Jamba has big man arms

Mrs. Hunter spanks me in gym class
And Mrs. Olscheski loves my ass
I haven't done my homework,
Not for a while
That's why Mrs. Ullman has
Georgene on speed dial!

Thank you and 'scuse me. Tee hee!
by Techno April 12, 2005
Stands for Sad Mackem Bastards.

Used to describe Mackem Sunderland fans. Often by Newcastle United FC fans.
Don't those sad mackem bastards ever wash?
by Geordie January 09, 2004
acronym for "Super Mario Brothers"
Dude, did you see the video of that guy beating smb 3 in 11 minutes?!?! it was h4x0r!
by andr0oz13 December 08, 2003
an abbreviation for Scratching my balls is a common element of Internet slang. It was used historically on Facebook but is now widespread in other forms of computer-mediated communication It is one of many initialisms for expressing bodily reactions inspired by smh(shaking my head) or (scratching my head) or which ever you prefer
for example:

JOHN: wats up

Rich: nothing much

JOHN: you going to the party tonight?

Rich: uh SMB Probably not

JOHN: Lol smb
by Oreo N/p April 17, 2010
French for "Suck My Dick" (SMD) : "Suce Ma Bite"
"I'm French, I got my baguette, you can SMB"
by lolzor06 May 29, 2012
suck my boobs sucker..comeback
tamara: your face scares me
tamara:ewwww no waay
by saahmaieesam June 30, 2010
Sexy man beast.
"Gahh. Corey Feldman is such a S.M.B."
by YOU ARE SO AWESOME. May 23, 2009