'Backsides' in the Bible

So the Lord's word to them will sound like meaningless gibberish, senseless babbling, a syllable here, a syllable there. As a result, they will fall on their backsides when they try to walk, and be injured, ensnared, and captured.

since you've been bumping aside all the weaker sheep with your backsides and shoulders, butting them with your horns until they're scattered around outside.