Whiff-lash

When you take a whiff of something that smells so loud it makes you jerk your head backwards causing "whiff-lash"

I opened my bag and took a sniff, it was so rank I got "whiff-lash"

Frienemy

Most people today. They are your friend to your face and at the same time they are your enemy.

She isn't really your friend kid, she is a frienemy. She would not defend you in a room where you aren't at.