I thought it was an EXPRESSION
of passion,
The Big Bang Theory Season 5, Episode 14
...and did so
using a stern facial EXPRESSION.
The Big Bang Theory Season 4, Episode 24
"Dead to rights"
I believe is the EXPRESSION.
Breaking Bad Season 5, Episode 14
...is an EXPRESSION of longing
for his missing foreskin?
The Big Bang Theory Season 6, Episode 5
What exactly does that EXPRESSION mean,
"friends with benefits"?
The Big Bang Theory Season 2, Episode 21