A. When you have a gator on the line tied to a swamp tree it will shake it trying to get free
B. When a obese person tries to ride a rope swing tied to an old apple tree.
Bayou bandit: "looks like we's gots a gator on da line! and it's a real tree shaker!"
Jimbo: "HOSS gettin' on dat swing!! "
"DAMN! He's a gonna bees a real a tree shaker!"