Rut? I think you mean CONSISTENCY.
The Big Bang Theory Season 2, Episode 20
You know of the four of us,
you have the most veal-like CONSISTENCY.
The Big Bang Theory Season 8, Episode 21
...where I kept track of shape,
color and CONSISTENCY.
The Big Bang Theory Season 6, Episode 3
and don't even ask about the
CONSISTENCY of my bowel movements.
The Big Bang Theory Season 10, Episode 7
In an ever-changing world,
it is a single point of CONSISTENCY.
The Big Bang Theory Season 2, Episode 16