Watermelon: noun A watermelon is a plant whose large, smooth fruit, with pink, greenish or white flesh, is edible.
Punch.
To go to be shine the watermelon: to go to be seen.
Plump and plump buttocks. "His hands firmly held this big firm ass like a hard and luscious watermelon" (Guillaume Apollinaire, Les Onze mille verges).
Have watermelon: have a big head
To have watermelons to death: to be very afraid.
Have fun with watermelon: party, have fun, have fun.
Riding the watermelon: "running" women, strongly upsetting.
Used in the entertainment industry since the early 90s, the term "watermelon" refers to a tedious task to accomplish.