我不止三岁我当然识趣
[wŏ bù zhĭ sān suì wŏ dāng rán shī qù]
'I'm more than three years old, and I understand social cues well', implies maturity and comprehension of societal nuances beyond one's young age in this online handle. It shows a kind of wisdom and wit in handling affairs maturely and gracefully avoiding unnecessary conflicts with good social sense.