Something that encompasses a wide variety of items or situations.
Neuroticism: this catchall term includes being anxious, depressed, etc, etc...
1. Someone's last name
2. Where a baseball player, or team (though rarely), catches every ball hit to him.
1. John Catchall
2. The baseball game ended last night 26-0 with a catchall.
A big ol' bag to put all your junk in.
She pulled three chairs and a table lamp out of her catchall.