In baseball, a lousy pitcher. Comes from "We need a pitcher, not a belly itcher!"
The Detroit Tigers are a great offensive team, but they don't stand much chance of post-season play. They have too many belly itchers.
A Belly Itcher is lazy, inactive and sluggish. Belly Itcher can also mean someone who is very silly, giddy or foolish.
1. I invited Kelly over for dinner, but she is being a belly itcher, and is too lazy to come out.
2. Shami was acting like a Belly Itcher when she pulled that prank on me.