别打我熊熊的主意了
[bié dă wŏ xióng xióng de zhŭ yì le]
"Bie Da Wo Xiongxiong De Zhuyi Le" translates as 'Don’t Mess With Me Bear-Bear (or don't have ill intentions towards me)', which serves as a cute, casual expression for defense. The repetition "Xiongxiong" adds cuteness. Someone might choose this username to present an approachable image with a bit warning: they are friendly yet unwilling to be taken advantage of.