A trope where a character is almost instantly defeated, despite their cocky attitude beforehand. Often a sexual scenario where a character ends up mating pressed despite their protests that they'll never lose to the dick, although it can also apply to non-sexual scenarios.
It most often follows a 2koma format, with a jump cut between the before and after panels, although it can also be a segmented comic spread across multiple separate posts.
Pixiv Encyclopedia said that it started as a personal webcomic series by a certain artist. After that, however, the original webcomics were deleted for some reason. The series name is now used as a general tag on Pixiv.
Just because a post depicts an SFW scene followed by an NSFW scene, it doesn't necessarily mean it's an "instant loss" situation.
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