fraidy cat 

1. A person who is too scared to take a dare.

2. A person who objects to participating in an activity because it's wrong.

3. A person who is phobic.

I don't want to put a live fish in my vagina!

Fraidy cat!

fraidy cat by Fly On The Wall October 24, 2004

'fraidy cat 

a timid person, especially a boy

His uncle was no 'fraidy cat when faced with the need to fend off muggers.

'fraidy cat by The Return of Light Joker April 17, 2011

Midget Fraidy Cat 

A grown person who is so afraid of midgets, that they cannot function in the presence of midgets. Even the sheer mention of a midget will put this person into a panic.
The person has a deathly fear of midgets

That Roy is such a midget fraidy cat

Midget Fraidy Cat by DPPD February 12, 2008