I have this tool on a few Swiss Army knives (though I think I've seen it on other multi-tools as well). What is it and what is it for?
On one edge, it has a sharp edge. It also only opens halfway (as seen in the photo).
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The tool has two purposes.
As a punch, it acts as a large needle. You can use it to sew leather or canvas, as mentioned in the other answers. Punch the tool through your fabric, put thread through the hole, retract the tool, repeat.
As a reamer, the non-uniform blade shape allows you to make quite good circular holes in plastic or wood. Punch the tool through, then rotate it to carve off a small circular sliver. Rotate again and again and again, adjusting position, to carve a fairly even circle.
As a reamer, it is for drilling small holes in wood. As an awl, it is for sewing thick material, such as leather, together.
Here are YouTube videos on how to sew with the awl-with-thread-hole tool:
In brief, these are my written instructions:
First, insert the thread through the awl, push the awl through the start of the hem, pull enough thread for the entire back side of the hem's stitching through to the back side of the hem, and then pull the awl back to the front side.
Now repeat the following for each successive lock stitch: Move the awl ahead, push it through to the back side as far as it will go and pull it back slightly -- just enough to create a loop with the front-side's thread -- and pause. Poke the back-side thread through the temporary loop then finish pulling the awl back to the front side. Tug both sides of the thread to keep them tidy. Tip: tie the back-end thread to the toothpick tool and use that to help thread it through the little loop.
To finish, tie both threads together (maybe singe them if they're nylon): Either make the knot over the edge of the hem, or use the awl to bring them to the same side of the hem and then tie together.
Better still -- watch the videos!