Definitions by Mr. Bird Poo

graydering 

When you try to let wind out quietly in public but the end result is audible.

1. Bob was graydering earlier today, it sounded awful and smelt bad too.
2. Alexandra was in a silent aeroplane museum when she did a gray de. I heard it loud and clear. She was very embarrassed for herself.

graydering by Mr. Bird Poo July 25, 2013