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When a guy has been hanging out with, or simply in the presence of a girl that is just a friend for long enough that she ends up becoming sexually desirable.

Based on the idea of sex-starved sailors who would see manatees frequently and eventually they began to see them as mermaids.

It was also used in the TV show How I Met Your Mother.
Guy 1: "So you're going to be rooming with a chick next year? watch out for the mermaid effect, if you hang out with her long enough, you know you'll end up wanting to hit that."

Guy 2: "Nah man, she isn't hot and totally isn't my type."

Guy 1: "I give it three months."
by acadey April 03, 2011
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2
When a man/boy goes an extended period of no wanking, women grow hotter exponentially each day.

Based on the idea of sex-starved sailors who would see manatees frequently and eventually they began to see them as mermaids.
The mermaid effect totally kicked in when I was camping last week. That tree with the hole started looking pretty good by the end.
by In honor of Steven Wright February 19, 2012
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