Plate Up
To go get some food, mostly at a buffet type setting.
BRB, I'm going to go plate up with some General Tso chicken.
Plated Up
To put false or incorrect number plates on a car or other (usually stolen or uninsured) vehicle to hide the true identity.
Just went to look at a car for sale, well dodgy though. I reckon it's plated up.
Plate Up
Dishing, spilling the tea, basically telling someone all the juicy gossip you have
Hey why dont you plate up and tell me what happened with Brandon!