The 'My Sides' meme is a legendary internet catchphrase used to signal that something is so incredibly funny it has caused the speaker's ribs to ache or, metaphorically, 'sent their sides into orbit.' Originating within the fast-paced culture of 4chan in the late 2000s, the phrase quickly became a staple reaction to greentext stories and absurd imagery. It is frequently paired with images of characters laughing uncontrollably, ranging from celebrities like Tom Cruise to iconic anime reaction faces. The meme serves as a digital shorthand for peak hilarity, capturing the physical sensation of a laughing fit that words alone cannot fully describe.