Origin
Instagram account @fathermemes posted meme in August 2019 showing measurement scale labeled “OOF SIZE” with arrow pointing to “LARGE” in response to situations deserving big reactions.
Cultural Context
“Oof” originated from Roblox death sound (2006), became general internet expression of sympathy/pain around 2017-2018. The “Oof Size Large” format quantified the severity of unfortunate situations.
Format
Used after witnessing harsh roasts, public embarrassments, romantic rejections, spectacular failures, or comeuppances. The measurement scale framing added scientific objectivity to schadenfreude.
Peak Usage
August 2019-March 2020 dominated Instagram and Reddit. Often paired with screenshots of devastating text conversations or brutal Twitter replies.
Decline
Format became stale by mid-2020, replaced by other reaction templates. The base “oof” expression outlived the specific “Oof Size Large” format.
Source: Know Your Meme - Oof Size Large