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1.
A steroid raging jerk who takes all the 45 pound plates at the gym leaving only 35 and 25 pound plates for everyone else. These tank top wearing, slightly over-weight, ego driven plate hogging jerks typically try to lift 450 pounds (improperly) while breathing heavy and moaning to get the attention of girls who laugh at them. These creatures may or may not be Italian guidos much like those seen on jersey shore.
I wanted to lift today but some plate hog had all the 45 pound plates so I had to wait.

Uh oh, there are a bunch of Italian guidos at the gym today. Plate hog alert!
by seanfrombaltimore December 01, 2010
 
2.
One who takes all of the appetizer plates that a waitress will put on a table without thinking of the other people at the table. Usually, the plate hog will just eat off of the top plate, leaving the rest of the stack intact.
Sunny: "Dude, DUDE"

Derek: "What?"

Sunny: "How 'bout spreading the plates for the rest of us"

Derek: "Oh, my bad"

Sunny: "Yo, you'se a plate hog"
by Double Mase November 07, 2010