Help me understand~~

Hi teachers~

I was watching a funny video on Youtube and I would like anyone of you to let me know the meaning of the expression.

I don't think it means something but

what I would liks to about this is that of the expression is common or he just made that up.

I pasted the address below.

You can find it at 1:38 in the video.

I would really appreciate it if you could take a look and let me know the answer.

Thanks in advance.