Top Definition
Immensely skilled, extremely enjoyable, high-quality oral sex. The type of head a mermaid would have to give in order to make up for the sexually-unusable lower half of her body.
Last night Ariel gave me Mermaid Head. It was so good, I almost didn't care that she wouldn't let me get into her pants.
by MiamiMountainMan August 21, 2014

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