Sometimes it's the upper body that is being left out: post #4209850.
The wiki mentions it only being for upper bodies but I'm not sure it makes much sense for us to keep that definition. In any case cropped_torso lower_body and cropped_torso cowboy_shot need to be gardened before this.
It's a bit of a weird circumstance, since all of the posts featuring the torso being cropped out also have cropped legs, but none that I've seen (that I can remember off top) which feature full legs. It can still be a point of discussion until the posts are scouted out and properly tagged, since the numbers are disappointing atm.
Edit: Heck, maybe it's just better to update the wiki definition since either half being cropped out makes sense. I just thought the implication was a good idea since I only ever saw upper bodies for that tag.