It's where your UNDERPANTS live.
The Big Bang Theory Season 9, Episode 10
"Leonard will restrict video gaming
in UNDERPANTS to hours Penny is not home.
The Big Bang Theory Season 10, Episode 13
Instead of UNDERPANTS, I covered
my crotch with potato salad. Thoughts?
The Big Bang Theory Season 3, Episode 15
I own nine pairs
of UNDERPANTS.
The Big Bang Theory Season 7, Episode 1
because you no longer
wear UNDERPANTS.
The Big Bang Theory Season 5, Episode 4