The gorilla row is a fun variation that'll challenge you a little differently than a normal bent-over row. These are typically done with kettlebells. If you only have dumbbells, just elevate them to about mid-shin.
Like a Meadows row, a slight rotation at the upper-back is good if you're properly braced and pressing down into the contralateral kettlebell. Not only will these blow up your back, but you'll likely get a good burn in the glutes and hamstrings.
Do 3-4 sets of 8-10 each side. Rest 90 seconds to 2 minutes before starting again.