six-by-eight

A jail or prison cell.

The average measurements of a jail cell is 6 feet by 8 feet.

You better start talking, punk. Or you'll spend the rest of your days in a six-by-eight.

cooch muncher

Or coochie muncher, is someone (usually a lesbian) who enjoys munching coochie (eat pussy).

"There is no point hitting on her, she is a cooch muncher."
"Oh, I didnt know she was a cooch muncher!"