means "suck my big toe".
guy one: oh my god. i had a threesome last night.
guy two: was your girlfriend there?
guy one: no, she can smbt. she was never any good at it.
by nunsaresxc January 27, 2012
Suck My Bloody Tampax!
Why don't you SMBT?
by GaiaVox April 21, 2016
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