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Adjective used to describe an amazing aspect of (usually breast) milk production.
Mom: Last night I breastfed the baby and then still was able to pump another 8 ounces.
Dad: Wow! That's lactastic!

RN: The lab finished the analysis on the mother's breast milk. It's 27 Calories per ounce.
MD: She might as we'll be making heavy whipping cream! She's lactastic!
by Assistant Professor X February 03, 2014
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