You're a VIXEN, Amy Farrah Fowler.
The Big Bang Theory Season 4, Episode 20
I'm going to feel like
such a VIXEN wearing jewelry
The Big Bang Theory Season 7, Episode 7
Amy, little VIXEN.
The Big Bang Theory Season 5, Episode 10
SHELDON". Oh, Amy, you naughty VIXEN.
The Big Bang Theory Season 10, Episode 23
What has that VIXEN
done to me, Leonard?
The Big Bang Theory Season 5, Episode 23