adj.

an insult evoking the likeness to a watermelon made of penis. delicious perhaps for some, but generally thought of as spoiling a delicious summer treat

in conjuction with the term dicktree, the word can be used to describe a man and his son who are both very annoying or mean (this suggests that prickermelon is the natural fruit of a dicktree)
That prickermelon just cut me off!

That dicktree cut in line because his little prickermelon was whining about waiting!
by GroggyWanderer June 8, 2009
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