ketchup

KETCHUP =  "Cat up."
I'm not kidding.
This sign is used by most of my friends who attended "Deaf Schools."
It combines "CAT and UP."  Heh, I love this sign.
You will also see the "up" concept spelled "U-P" or done by moving an "A" handshape upward (the thumb pointing up).

Here is a general version that looks like trying to get ketchup out of a bottle: