Cockserphobia originates from the word claustrophobia. Claustrophobia is the fear of being in a space that is too small. Cockserphobia is the fear of having more than one penis inside of you at one time.
Me: Hey Sarah want to have a threesome with two dudes this weekend?

Sarah: No I have cockserphobia...

Me: What's that?

Sarah: I'm scared of having more than one penis in me at one time.

Me: Word
by Balls out. Ya dig? January 10, 2014

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