See? It's right here after
"providing a confirmation SNIFF
The Big Bang Theory Season 5, Episode 15
And I watched you SNIFF Joe's
hair when he wasn't looking.
The Big Bang Theory Season 12, Episode 16
SNIFF that business?
I don't think so.
The Big Bang Theory Season 12, Episode 10
if instead of talking we could
just SNIFF each other's butts?"
The Big Bang Theory Season 7, Episode 12
I know one way to find out. Sniff this.
The Big Bang Theory Season 9, Episode 18