What's a waterloupe?

I went to the regular old grocery store and bought a regular old watermelon out of a regular old bin of other regular watermelons in the regular old produce section. Imagine my surprise when I cut the melon open to find it bright orange! Last time I ate watermelon it was pink inside... This melon looked just like a cantaloupe with black seeds! It was really weird because it still tasted just like watermelon. (A really good one too!) Hmmm....Texas is a very interesting place.