When one or both of the female's breasts are feeling under the weather, thus resulting in violent projectile regurgitation via the nipple hole.
"Excuse me teacher... Can I please go to the bathroom? I think I have sick tits."
"Hey, why is her shirt all wet?"
"Oh, she has sick tits."
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When something is REALLY wicked, or extra good.
One: Man check this out, this sandwhich was only 90p...
Two: MINT! That is Sick Tits
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Usually an interjection, used when something goes ones way.
Guy #1: I just got laid 14 times in a row.
Guy #2: Sick Tits!
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