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".

The first death

Another slang term for the sexual act of climax during intercourse "Intense Orgasm". in this case the type that leaves you outta breath and gasping for air.

Last night the sex was so good, it felt like I died in went to heaven. That's why they call it the first death.