A few weeks earlier, I thought of this rebus:
and it could be interpreted as:
"seven" and "eight" mixed together.
What common phrase does it mean?
After thinking of this answer, I retracted my close vote and even changed the downvote into an upvote. Please read this answer before VTC-ing. Seriously.
In Chinese, seven is 七 and eight is 八, the rebus is seven and eight mixed together(亂), and the whole phrase simply means messy