Unforesmelt 

Adjective: unforesmelt or unforesmelled

An unanticipated or unexpected smell, often pertaining to flatulence.

My earlier snack of dill pickles with cream cheese has had unforesmelt consequences.

Unforesmelt by Sir Garence March 7, 2009

Unforsmelt 

Innocent bystanders effected by a foul smell they could not have predicted.

Owh Trevor! Did you have a curry last night?! That was unforsmelt wasn’t it!

Unforsmelt by Fifty shades of graham July 30, 2018