Eight track

8-track tape is a magnetic tape used from mid-60's to 80's in US to broadcast jingles or publicity

"I might throw this on an eight track" Jopping, Mark Lee.

Seven Eight

It is pronounced as "qiba" in Chinese, and it sounds similar to "jiba" in Chinese, which means penis, and Chinese people often use penis as a swear world, so every time they want to swear but without using the real bad word, they will use "qiba", which is seven eight to instead.

Rude way: You are so jiba stupid
Polite way: You are so qiba(seven eight) stupid