Stale Pancake

Someone who is usually fun to hang with but is acting like a pussy and won't be adventurous or take any risks. Like a pancake, usually good but once it's stale it's shit.

Ray: Why didn't Joe want to go cliff jumping with us? He is usually down for that kind of stuff.
Pam: I don't really know, he's being a Stale Pancake though.
Ray: What a pussy...