From the Super Mario Wiki
Sling-a-Thing (known in PAL regions as Fling-a-Thing) is a carnival stand in Paper Mario: Sticker Star.
After the Toads unroll and restore Decalburg's plaza, if Mario heads left, he will find a stand operated by a Purple Toad. However, the Toad will tell Mario the stand is not yet open. After obtaining a Thing in Bouquet Gardens, the stand will open for business. When Mario stands on the platform, he can select a Thing and throw it at the board in front. The Thing is then turned into a sticker that is usable in battle or in Paperization.
Another stand operated by a Red Toad appears in Outlook Point inside an alcove right of the sticker shop.
Paper Mario: Sticker Star
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