Fraidy cat
Definition: One who is scared of everything
Example:
Freddy: Fraidy cat!!
Jenny: Oh look. There's a spider on your head.
Freddy: Where?! Get it off!!
Jenny: Heh heh heh.
WARNING: These cruel, insensitive and politically incorrect insults are presented for informative purposes only! Do not use in real life, even if your classmates do smell like poop, behave oddly, see poorly or suck up to the teacher.
