
"Dutch" is a bastardization
of the word "Deutsch,"
The Big Bang Theory Season 12, Episode 7

...to the Dutch researchers
that Leonard is currently ripping off.
The Big Bang Theory Season 3, Episode 10

why they're called
Pennsylvania Dutch
The Big Bang Theory Season 12, Episode 7

I'm employing the work
of Dutch researcher, Mirjam Tuk,
The Big Bang Theory Season 7, Episode 19