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."
ayon kay acadey ika-03 ng Abril, 2011
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.
ayon kay In honor of Steven Wright ika-19 ng Pebrero, 2012

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