What is Straight Face?
1.
Showing that one is completely serious.
Lindsay Lohan's performance in I Know Who Killed Me sucked; she couldn't say one thing with a straight face.
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2.
The act of a male receiving oral intercourse whilst the giving partner does not use their hands in any way. Usually performed by woman with low self-confidence and no gag reflex.
Hey look! That girl Adrian knows is giving everybody straight face!!
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3.
Dead Serious.
You are Dumb... Straight Face. I'm not smiling :-/
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4.
Meaning to keep a "striaght face"during conversation or any type of activity.
Let's ride out to Shawty's crib, I'll sho nuff straight face that bitch.