This listing confirms that the phrase exists online, attached to video content, providing the "smoking gun" for your search. It's important to note that the content in question, based on the search term's origin, is likely adult-oriented in nature.
Adult Anime / Hanime / Japanese Interactive Visual Novel Source shinseki no ko to wo tomaridakara de nada video full
The phrase "shinseki no ko to wo tomaridakara de nada" appears to have originated from Japanese online forums and social media platforms. It's unclear who first coined the phrase or what the initial context was. However, it's evident that the phrase has taken on a life of its own, with many users sharing and discussing its meaning. This listing confirms that the phrase exists online,