Is it weird to be extra hungry the first few weeks after liposuction?

Not necessarily. Feeling excess hunger after liposuction does not occur commonly, but I wouldn't characterize it as "weird". Sometimes after recovering from trauma the body has an increased demand for nutrition during the healing process. This can lead to increase in appetite to provide extra needed calories.
Normal. It's normal to be extra hungry after any surgical procedure. Keep your diet well balanced.
Appetite post surger. Any surgery will result in an increase in wound healing and metabolism triggering the need increased protein and nutritional intake.
No. No, any surgical procedure or other form of “trauma” can cause your body to “crave” additional nutrition/hydration. It is important, however, after any type of body contouring surgery to maintain a healthy diet and exercise program.