This word basically means that something, usually the more private parts are fake. It is used to mean something fake around the penis area, or for a girl, fake breasts.
Damn! I can just tell that guy to be real!
This is the abbriviation for "Saggy Man Boobs"
You know when guys have too much boob, and they sag? Well then your guy has SMB's.
I couldn't stand to look at him because his SMB's would jiggle whenever he walked.
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