bubble tea challenge
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A meme in which a character balances bubble tea (or a similar drink) on their breasts while drinking it.
The meme originated on Twitter in June 2019 when Japanese model @hcupadman posted a video of herself drinking a latte balanced on her chest [1]. Later Himura Kiseki, the creator of the Tawawa challenge, posted a comic of Ai-chan performing the same act with bubble tea (Danbooru post #3532540).
A common gag is for flat-chested characters to cheat or fail at the challenge. If boys participate in the challenge at all, they will often be balancing the object on prominent manboobs or large pectorals.