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

Dime minus eight

When a female only registers a 2 on the national dimepiece scale.

Nigga you trippin! That ho is a dime minus eight. Her bottom lip looks detached and she be missin a titty!