Definition

Extremely, impossibly, aggressively adorable—short for 'cute as f***,' used when normal language fails to capture the maximum level of cuteness something has achieved. It's the linguistic equivalent of turning your enthusiasm up to 11.

Example Usage

That puppy video is cute af, no cap.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Cute%20af&defid=15068374)