To be in a dazed, semiconscious, crazy, or love-stricken state. Believed to be caused by a phase of the moon.
"Ted sure looked moonstruck after he drove his new lamborghini around the block."
by SumaDemDer January 11, 2013
a phenomenon of a stupid man who totally loses his mind and starts acting dumb whenever he sees hot chicks. even a man of ability falls into this category. so almost every man is a moonstruck dog.
he acts like a moonstruck calf on chicks.
by lolito March 25, 2005

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