first sniffs 

The act of directing one's gaseous expulsions toward those around them (mostly in the form of a fart)

Being selfless with one's malodorous gifts

His generosity was evident from his willingness to give family and friends first sniffs.l

first sniffs by Phishy November 19, 2004

First Sniff of Death 

When you walk in to a toilet cubicle at work realising someone else has just been there and you can only hold your breath for so long.

The First Sniff of Death is that first breath.

Buddy: "You look a bit pale. Everything ok?"
Me: "I went to the can and realised too late that Colin had just been in before me. The First Sniff of Death melted my sinuses and have permanently damaged my nostrils and lungs".

First Sniff of Death by Dolphsps January 5, 2018