This calls for an
EXPRESSION of gratitude.
The Big Bang Theory Season 5, Episode 20
but I think I'm just an EXPRESSION of...
The Big Bang Theory Season 9, Episode 11
I thought it was an EXPRESSION
of passion,
The Big Bang Theory Season 5, Episode 14
What exactly does that EXPRESSION mean,
"friends with benefits"?
The Big Bang Theory Season 2, Episode 21
...is an EXPRESSION of longing
for his missing foreskin?
The Big Bang Theory Season 6, Episode 5