Damn onions
A popular term often used on social media in response to a sentimental, sappy, or emotionally-charged video or meme that makes you "tear-up". It's a metaphor referring to how your eyes water when you're
cutting onions. The phrase is used by the poster as a means of deflecting or "
saving face" from admitting they were emotionally affected to the point of tears
welling in their eyes from what they just saw or read.